Showing posts with label Bakelite. Show all posts
Showing posts with label Bakelite. Show all posts

Tuesday, June 6, 2023

Those Happy Days

 

QUESTION: After the death of my mother, I’ve started to clear out my parent’s house to get it ready for sale. Among the items I’ve been sorting through were a good number of what I believe were things from the 1950s. Since I was only a small child during that time, I’m really not exactly sure what is from back then. Can you give me an idea of the type of things that might have some resale value and where I might sell them?

ANSWER: The 1950s were a time of relative prosperity after the end of World War II. However, items from back then fall into two categories—higher end pieces like futuristically designed furniture and accessories and everyday items like kitchen and household wares. And collectors are pretty much divided into these two groups, also.

Many people, especially younger ones, view the 1950s as a time of carefree happy days. The T.V. show “Happy Days” did a lot to help that a long. But, in fact, the decade was filled with rules and restrictions, the result of which caused the backlash among younger people in the 1960s.  But recently collectors have been resurrecting and rediscovering the era, albeit while wearing rose-colored glasses.

However, the 1950s was a decade of creative solutions and bold designs. Objects once outdated, corny and embarrassing, whose final resting place was yard sales and thrift stores, are now found in pricey shops in major cities. This serious second look from dealers,. collectors and architects transcends all the outlandish fads, weird shapes, silly ideas and annoying colors. What they’re now seeing are progressive designs and superb workmanship, mostly on the high-end pieces. 

Transitional best describes the Fifties decade. America was passing out of the dark, serious, wartime 1940s into a colorful era of discovery, experimentation, and prosperity. Veterans were starting families in the suburban developments like Levittown in both Long Island and southeastern Pennsylvania. Mom’s found themselves bound by their apron strings in the kitchen while dads went off to work. Dwight Eisenhower led the country while Willie Mays and Mickey Mantle dominated centerfield. And automobiles were large, showy, and powerful.  

Designers, fueled by the exploration of outer space, applied the graceful, soft curves and lines of Art Deco to furniture and appliances, which took on streamlined, futuristic shapes. When the Russians launched the world’s first satellite, Sputnik, in October 1957, merchandise that resembled sleek spacecraft seemed all the more apropos for the times.

News broadcasts came over Bakelite and C radios that sported rounded, curved lines and often bold coloring. Designers adopted shiny chrome for lamps, table and chair legs, blenders, toasters, and waffle irons. Tubular steel added simplicity, beauty and durability to furniture and accessories. Lighting fixtures and clocks sprouted appendages resembling sparkling celestial bodies or satellites.

For the growing middle class, manufacturers employed chrome's step-sister, aluminum, to mass-produce inexpensive tumblers, goblets, cocktail shakers, trays and ice buckets. Plastic, especially red, could be found in most kitchens in condiment containers and curtains. Cabinets contained Fiesta ware, simple, pastel-colored dishes for everyday use.

Decorative figurines became popular. No living room was complete without a black ceramic panther slinking on a tabletop or used as a lamp base. Small ceramic lamps with a doll, animal, or other figure, marketed as the perfect little glow to set atop the TV, supposedly helped to save viewers’ eyesight in darkened rooms.

Coffee tables assumed the shape of boomerangs. Wall clocks looked like exploding, atoms or models of molecular structure. Kitchen tables, made of durable Formica in bright red, yellow, and often turquoise, complemented shiny white enamel hanging cabinets. Builders of new suburban homes tiled the bathrooms in black and pink or sea green. 

In the better part of towns, a sophisticated 1950's home might contain a pair of Eero Saarinen's all-enveloping womb chairs in bright red, or had as its piece de resistance a free form, walnut and glass coffee table designed by Isamu Noguchi. 

Baby boomers, looking to recall items with which they grew up, have fueled the current interest in what’s now commonly referred to as the Mid-Century Modern style—taking in the 1950s and 1960s. They perceive the Fifties as an innocent time compared to now.

Manufacturers designed products for the Machine Age, using mass-production and assembly line methods. Thus, many of today’s collectors seek pieces developed by specific designers whose creations bring higher prices.

Charles Eames worked for the Herman Miller Company of Zeeland, Mich. He popularized furniture made of laminated plywood and bentwood. George Nelson, also of Herman Miller, designed clocks and furniture. Paul Frankl designed furniture from the 1920s to the 1950s. Influenced by Art Deco, he used both geometric and curved shapes. His simple, black and white, curved lacquered pine tables and desks today sell for several thousand dollars each.

Knoll International of New York employed Eero Saarinen. Best-known for his molded plastic womb chair, he worked also in cast aluminum. Italian immigrant and sculptor Harry Bertoia also designed for Knoll, where he pioneered in using metal rods and wire in side and lounge chairs. And Gilbert Rohde, also associated with the Herman Miller Company, combined traditional mahogany and maple with chrome and glass.

Russel Wright worked in glass, plastics, aluminum, textiles, pottery and furniture. He designed tableware for the Steubenville Pottery Company, Iroquois China Company, and Harker Chinaware. And he developed furniture for Knoll and Heywood Wakefield.

Unlike painters, these artists didn’t sign their work, so collectors need to learn to identify furniture by shapes, materials, and quality of workmanship. Although the furniture usually had manufacturer data on paper labels, many of the labels have long since fallen off.

Other companies mass-produced less expensive look-alike imitations of designer furniture. And the U.S. courts refused to allow the original designers to legally. protect their work, which further complicated matters.

Fifties merchandise sells consistently well, especially chrome kitchen appliances, decanters, cake covers and lazy Susans. During the 1990s, items from the 1950s was cheap by today’s standards. But as the popularity of these items has grown, so have the prices. Aluminum Christmas trees, illuminated by a revolving color wheel, are a good example. Once castaways, they now sell for over $150.

And while Fifties kitchen appliances are still popular with collectors, especially if they’re in excellent condition, the market for them has softened somewhat.  However, colorful Bakelite and Catalin radios still sell for three figures.

As far as selling items from the 1950s, both eBay and Etsy are probably the best bet. Selling them at yard or garage sales or fleamarkets won’t really yield much of a profit. Regardless of the site, the Internet offers a global market with the possibility of selling at higher prices.   

The consensus among dealers today is that a lot of 1950s furnishings sit in attics, basements, and thrift shops waiting to be purchased for a song by the wise buyer who has memorized the music. And that means that happy days may be making comeback.

To read more articles on antiques, please visit the Antiques Articles section of my Web site.  And to stay up to the minute on antiques and collectibles, please join the over 30,000 readers by following my free online magazine, #TheAntiquesAlmanac. Learn more about "Advertising of the Past" in the 2023 Spring Edition, online now. And to read daily posts about unique objects from the past and their histories, like the #Antiques and More Collection on Facebook.



  




Monday, March 20, 2023

The Plastic That Shaped the Future

 

QUESTION: Recently I purchased a box of assorted costume jewelry at a flea market. What intrigued me was the variety of colorful plastic bracelets in the assortment. While these look like they’re made of regular plastic we know today, the dealer told me they were Bakelite. My grandfather once told me that Bakelite was the first plastic. He had an old radio that seemed to have a plastic case. At the time, I didn’t believe it because I thought plastic was a mid-20th century invention. What can you tell me about Bakelite? Who invented it and when?

ANSWER: Without knowing it, you’ve discovered a treasure of the early 20th century. Bakelite was a chemical miracle of the 20th century. It enabled manufacturers to make a variety of items—children’s toys, kitchenware, pipe stems, wall switches, appliance and cutlery handles, colorful radio cases, and yes, jewelry. Dubbed the “Material of a Thousand Uses” by the Bakelite Corporation, Bakelite was versatile and nonflammable.

Leo Baekeland developed this innovative form of plastic in his backyard laboratory in Yonkers, New York, between 1907 and 1909. He attempted to create a synthetic shellac when he discovered that phenol, or carbolic acid, and formaldehyde, when combined under certain conditions, resulted in a molasses-colored resin with unique and exceptional properties.

Once cured, the phenol formaldehyde resin could be ground into powder and mixed with a variety of fillers to create a molding compound that was practically indestructible. Slate dust, asbestos, wood flour and ground walnut shells were all used for this purpose, but because of their dark color, molded Bakelite was limited to shades of black, maroon and brown.

In1911, he founded the General Bakelite Company in Perth Amboy, New Jersey, which produced up to 200,000 tons of the plastic each year. Because it was resistant to heat, moisture, and chemicals, it became a component of the electrical industry. It also had excellent insulating properties, making it perfect for use in electrical insulators, switches, plugs and sockets. 

Making Bakelite was a multi-stage process. It began with the heating of phenol and formaldehyde in the presence of a catalyst such as hydrochloric acid, zinc chloride, or the base ammonia. This created a liquid condensation product, referred to as Bakelite A, which was soluble in alcohol, acetone, or additional phenol. Heated further, the product became partially soluble and could still be softened by heat. Sustained heating resulted in an "insoluble hard gum." 

However, the high temperatures required to create this tended to cause violent foaming of the mixture when performed at standard atmospheric pressure, which resulted in the cooled material being porous and breakable. Baekeland's innovative step was to put his "last condensation product" into an egg-shaped "Bakelizer." By heating it under pressure at around 300° F, he was able to suppress the foaming. The resulting substance was extremely hard and both infusible and insoluble. The range of colors available included black, brown, red, yellow, green, gray, blue, and blends of two or more of these. 

Bakelite came in various forms to suit varying needs, including clear material, for jewelry and smokers' articles, cement, used in sealing electric light bulbs in metal bases, varnishes, for impregnating electric coils, lacquers, for protecting the surface of hardware, and enamels, for giving resistive coating to industrial equipment. In addition, there was laminated Bakelite, used for silent gears and insulation; and molding material, used to form items of utility and beauty.

When Bakelite’s patent on phenol formaldehyde expired in 1927, other companies using the chemical came on the scene, including the American Catalin Corporation which pioneered a purified form of phenolic resin that did away with the dense fillers used in molded Bakelite. The company introduced casting resins in 20 different colors.

The Bakelite Corporation quickly developed its own phenolic resin, producing it in thousands of colors. In reality its recipes were exactly the same as American Catalin, except they experimented more with dye saturation and mixing colorants with clear resin to create mottled and swirled effects.

By the mid 1930s, several competitors had begun producing phenolics which forced the price of both Bakelite and Catalin down. One of these other companies, Fiberloid, introduced Opalon in lapis lazuli, mottled red, alabaster, onyx and mottled walnut, fabricated into board game pieces, jewelry, and umbrella and knife handles.

The introduction of electrical power gave rise to a wide range of labor-saving devices that utilized Bakelite and Catalin in one way or another. The modern appearance, durability and hygienic qualities of plastic made it superior to traditional substances.

Bakelite quickly replaced wood and metal in telephones, clock and barometer cases, as well as knobs and handles on small appliances like electric irons, toasters and cookware. Colorful Catalin cutlery handles and novelty napkin rings dressed up the table and brightened the kitchen.

In 1933 the Bakelite Corporation began to produce wood-tone radio cabinets of compression-molded phenolic resin. Thermosetting plastics resisted the heat generated by radio tubes, making Catalin ideal for radio cabinets. It wasn't long before colorful, modernistic Catalin radios began to make their appearance.

By 1936, various companies made two-thirds of all costume jewelry produced in the U.S. by fabricated molding and fabricating cast phenolic resin. The fabricating process, however, was labor-intensive and lengthy.

First, molds had to be made by dipping a steel master into molten lead. Once workers  assembled enough molds, others prepared phenolic resin and carefully poured it into each mold by hand. A technician carefully combined resins as casting occurred if special swirled or mottled colors were desired, the technician needed to carefully combine resins as they were being cast.

Once filled, workers wheeled the molds into a huge oven to be baked  at176 degrees F. until the resin cured. Curing time varied. Dark red and blue cured in three to four days while whites took six to eight days. Once the cast resin cured, workers removed it from the lead molds using air hammers. This always resulted in damaged molds. Other workers tossed the broken pieces back into the vat of molten lead to be melted down for reuse.

To make jewelry components, workers cut shaped or hollow phenolic rods into individual pieces, much like slicing a loaf of bread. Then they carved and machined by hand them for added adornment. Once they completed the decorative carving, they finished the pieces by tumbling or buffing on a polishing wheel.

Bakelite became a symbol of progress and modernity as the streamlined Art Moderne style overtook the chic style of Art Deco. The sharp-stepped sides of skyscrapers softened into curves, while boxy trains and automobiles became sleek, with fluid lines that created the illusion of speed and motion.

By the late 1930s, plastic moldings reflected the streamline design trends. Shiny surfaces, modernistic curves, waterfall fronts and facades, made to look like car grills, all found their way into jewelry, small home appliances and decorative household objects.

Perfectly suited to Bakelite and Catalin molds, the Art Moderne style enabled the resin to easily flow inside a curved mold. In addition, it was easier to mold, fabricate, and polish the resulting casts than the boxy, stepped sides and sharp corners of Art Deco designs.

Cast phenolic resins weren’t as durable as compression molded phenolic compounds because they shrank over time, often resulting in cracks. Catalin averaged a 4 percent shrinkage in the first 10 years. Cracks developed in radio cases because the parts were bolted to the housing, leading to stress as the plastic shrank.

Though companies produced Catalin in 20 opaque and translucent colors, engineers limited the color range because they felt all other dyes would cause instability in the plastic.

Unfortunately, Catalin reacted to ultraviolet light by converting to phenyl alcohol, which was brownish in color. That was why so many Catalin items are amber colored. The effect turned original white to butterscotch, bright blue into drab olive, green into butterscotch, and brilliant red marble into brown.

To read more articles on antiques, please visit the Antiques Articles section of my Web site.  And to stay up to the minute on antiques and collectibles, please join the over 30,000 readers by following my free online magazine, #TheAntiquesAlmanac. Learn more about "folk art" in the 2023 Winter Edition, online now. And to read daily posts about unique objects from the past and their histories, like the #Antiques and More Collection on Facebook.


Tuesday, August 15, 2017

Shaken Not Stirred



QUESTION: A couple of years ago, I happened to be browsing in my local Goodwill Store and noticed an elegant cocktail shaker. Its chrome exterior glistened in the light of the florescent bulbs overhead. The price tag said $3. How could I resist? I couldn’t and didn’t. Now I have a small collection of this elegant barware. Since I’m not really a drinker, I don’t know much as mixed drinks, especially martinis. I’d like to know who made the first martini and how the cocktail shaker came into being. What can you tell me about these elegant items?

ANSWER: Cocktail shakers weren’t always this elegant. The first shakers were hollowed out gourds. Back in ancient Egypt and Mesopotamia they served to mix liquids together and as such were a practical accessory for books back then. But they lacked the style of 20th-century shakers.

Collectible cocktail shakers arrived just after the invention of the martini. However, there seems to be some controversy as to just when that happened.

It isn’t known for certain who first mixed and served the first martini. The best guess places this great event in late 19th-century America. There are several theories as to its origin. One  credits a bartender named Jerry Thomas at San Francisco's Occidental Hotel in the 1860s with mixing a special drink for a traveler bound for the nearby town of Martinez. But for some reason, Thomas didn’t include the recipe for a martini in America's first cocktail book, How to Mix Drinks, or The Bon Vivant's Companion, that he first published in 1862, until the 1887 edition.

There are those, however, who insist that the martini, consisting of equal parts of gin and dry vermouth, was a New York invention, probably first mixed at the Knickerbocker Hotel by bartender Martini di Arma di Taggia. But if both sweet and dry vermouth were used, then the honor could belong to William F. Mulhall, who served drinks of this sort at Hoffman House, also  in New York City, in the 1880s.

Ever since those first concoctions, martinis have been a stylish drink, appreciated not only for the kick they deliver, but also for the accessories used in their preparation and enjoyment. The first recipe calling for an accompanying olive can be traced to 1888, with the v-shaped martini cocktail glass appearing early in the 20th century. Bartenders who made early martinis  either stirred the liquors together or poured them from one glass to another to mingle them together.

By the time that Prohibition came to an end in 1933, people throughout the nation enjoyed drinking martinis. Often viewed as the drink of trendsetters and glamour seekers, martinis became associated with movie stars, including William Powell and Myrna Loy. People at the time saw martinis as very American, urbane, high-status, masculine, optimistic, and adult— a drink for the wealthy and the powerful, or those aiming for that status. 

Wealthy bon vivants of the 1920s shook theirs up in silver, while their less affluent counterparts turned to glass or nickel-plated models. By the following decade, mass- production made shakers a reality for those with fewer means, manufacturing the shakers in chrome-plated stainless steel.

Every maker of decorative home furnishings made cocktail shakers in the 1920s and 1930s, from Tiffany to aluminum manufacturers. While the Chase Chrome Company, Revere Brass and Copper, and Farber Brothers were leaders in the production of metal shakers, Hazel Atlas, Imperial, Duncan Miller, and Cambridge Glass made them of glass.

As the demand for barware grew in the 1930s, the designs became more varied. Makers produced sleek shakers from silver and silver-plate. Some even sported Bakelite handles and trim. The shakers themselves featured Art Deco designs, from airplanes to dirigibles, dumbbells to golf bags. Some even took on the shapes of modern buildings.

The golden age of cocktail shaker design came to an abrupt end with the beginning of World War II. Metals were earmarked for the production of armaments, and cocktail shakers no longer seemed a priority to a country at war.

While cocktail shakers can be found at garage sales, flea markets, and thrift shops for under $10, the better designed ones can sell for four or five figures.

To read more articles on antiques, please visit my Web site.  And to stay up to the minute on antiques and collectibles, please join the other 17,000 readers by following my free online magazine, #TheAntiquesAlmanac.

Tuesday, August 9, 2016

Don’t Take Any Wooden Nickels



QUESTION: I was recently cleaning out drawers in my mother’s house after her death and came across a bunch of coins with the slogan “Millions for Defense, But Not One Cent for Tribute” impressed on one side. On the other side is the Liberty Head and the words ONE CENT. At first glance these look like pennies but are larger. What can you tell me about them?

ANSWER: What you have aren’t coins but tokens. Like the famous wooden nickels, merchants used tokens as a way to promote their businesses and some commemorated events. By 1900, tokens had become a common type of coinage by which merchants not only advertised, but created good will and repeat business. The token was in effect a pledge redeemable in goods but not necessarily for currency.

Tokens are coin-like objects used instead of coins and either have a denomination shown or implied by size, color or shape. The use of tokens dates back to Roman times. Back then, the Romans used coin-like objects called spintria to gain entrance to brothels and gaming establishments.

Medieval English monasteries issued tokens to pay for services from outsiders. Residents of nearby villages called these tokens "Abbot's money."

Though token manufacturers usually made them of cheaper metals, such as  copper, pewter, aluminum, brass, and tin, they also used fiber, bakelite, leather, porcelain, and wood.

Sometimes called merchant tokens or “good fors,” American trade tokens originated during the late 18th century, when early circuses produced them for admission to their performances. In the 1820s, manufacturers began commercially producing tokens and this led to a greater demand.

In July, 1836 Congress enacted President Andrew Jackson's "specie circular" law, requiring specie—that is, gold or silver—to be used to pay for government land. This caused people to believe that paper currency, at the time issued by state banks, was unsound. As more and more people began using specie, regular coins disappeared from circulation.

To make it easier for individuals to trade for goods, business men and various organizations began issuing tokens that could be used instead of coins. These tokens became a substitute for one-cent pieces, since they had the same metallic content and size. The token designs could be divided into four categories: those that mentioned the bank and the banking crisis; those that were satirical and sarcastic, the political cartoons of the day; those that were made in imitation of real money; and those issued by enterprising merchants carrying advertising.

The Hard Times tokens of the 1830s and 1840s continued to make merchant tokens popular. During the Civil War, tokens again came into wide use because of the coin shortages caused by it. After the war, merchants once again issued tokens and people continued to use these “good fors” to trade for goods.

Among the many tokens made in imitation of the coins driven from circulation were a number using the phrase, "Millions for Defense, but Not One Cent for Tribute." These tokens bore the familiar Liberty Head and on the reverse the wording was strategically placed to have an enlarged ONE CENT appear as it would on government issued coins. The phrase, "Millions for Defense, but Not One Cent for Tribute," was a rallying cry for America on two occasions in history.

Besides Civil War tokens, there were also wooden tokens, transportation tokens for bridges, toll roads, ferries, and the like, gaming tokens, political tokens, as well as those used by magicians for admission to their acts, churches for permission to receive communion, tokens for telephones, and to pay sales tax. Elongated coins—often pennies pressed flat and made smooth on one side to take etchings of the Lord’s Prayer, Scouts’ oath, and club insignias also were popular.

All kinds of merchants issued tokens for use in their own businesses, including general stores, grocers, department stores, dairies, meat markets, drug stores, saloons, bars, taverns, barbers, coal mines, lumber mills and many other businesses. The era of 1870 through 1920 marked the highest use of "trade tokens" in the country, spurred by the growth of small stores in rural areas.

Railways and public transportation agencies used fare tokens for years, to sell rides in advance at a discount, or to allow patrons to use turnstiles that only to took them. The use of transit tokens in America began in 1831, when John Gibbs issued them for use on his U.S.M. stage in New Jersey. The 1830s saw tokens used on horsecars and horse-drawn omnibuses. By 1897, the U.S. had its first subway in Boston, and in 1904 the New York subway system opened. Ferry, bus, and streetcar companies also produced tokens often out of cheap white metal, aluminum, or more costly bronze. Most of them featured cutouts in the shapes of letters to differentiate them from other coins.

Some churches used to give tokens to members passing a religious test prior to the day of communion, then required the token for entry. Most of these were pewter, often cast by the minister using the church’s own molds.

But probably the most well-known token is the wooden nickel. Merchants and banks gave them to their customers to redeem for a specific item, usually a drink. On December 5, 1931, during the Great Depression, the Citizen’s Bank of Tenino, Washington, failed and issued emergency currency printed on thin shingles of wood. Local merchants couldn’t get change without traveling 30 miles over mountainous roads which took four hours one way.  So the bank, at the insistence of the Chamber of Commerce, decided to issue it’s own money, some of which was in five-cent denominations.

The Chicago World's Fair in 1933 issued wooden nickels as souvenirs, and the tradition of wooden nickels as tokens and souvenirs was born. The phrase, "Don't take any wooden nickels," reminds people to be cautious in their business dealings since some unscrupulous characters tried to use them in their dealings with people.

Monday, July 2, 2012

Those Happy Days



QUESTION: My mother had a cabinet full of Melmac dishes in a variety of pastel colors. We used them for every meal. Now I have them and while most have seem better days, they bring back fond memories of my childhood. What can you tell me about them? Are they collectible?

ANSWER: Your Melmac dishes are certainly collectible, as hundreds of collectors of the plastic ware can attest. The most collectible pieces are from the 1950s when items such as this signaled the dawn of future of ease for American housewives.

Everyone knows of “Happy Days,” the 1950s-era T.V. sit com, featuring a typical middle class family. The mother on that show, much like scores of other American housewives of the period, must have thought she had died and gone to housewares heaven with the advent of Melmac dinnerware. That was just one of the items that made her days truly happy because its durability made it ideal to use in homes with children.

Initially discovered by William F. Talbot in the 1940s, Melmac, the name given for the hard plastic melamine resin by its chief maker American Cyanimid Corporation, was first used in the military.
Dishes made of early plastics and Bakelite did not hold up well or withstand regular washings or heat, but American Cyanimid showed that its new "improved plastic" could indeed hold up well. While the company produced the resin, itself, it sold it to other manufacturers which molded it into dinnerware lines for both home and restaurant use.

The Plastics Manufacturing Company of Dallas, Texas, produced Texas Ware, Dallas Ware, Oblique, SRO and Elan. The Boonton Molding Company of Boonton, New Jersey, offered Boontonware, Patrician and Somerset. International Molded Products in Cleveland, Ohio, produced Brookpark/Arrowhead Modern Design and Desert Flower lines designed by Joan Luntz. And the Prophylactic Brush Company of Florence, Massachusetts, made Prolon. Its Florence and Beverly lines were the most popular for home use.

During the late 1950s and 1960s Melmac dinnerware found its way into just about every American home. However, the tendency of melamine cups and plates to stain and scratch led sales to decline in the late 1960s, and eventually it became largely limited to the camping and nursery markets.

Melmac is used for just about any type of dinnerware, including plates, cups and saucers, serving pieces, and glasses. Manufacturers could add any type of color pigment to the resin during the molding process. As a result, they created it in a variety of colors and patterns. Muted colors, such as pea green and seafoam appeared in the late 1950’s, and during the late 1960s, makers experimented with interesting color combinations to complement the psychedelic look of the time.

Today, you’ll find vintage Melmac in thrift stores, at estate sales, online auction sites, and garage sales. It's fun to collect it and due to it's long production, it’s easy to make a whole set. Some Melmac pieces are worth more in value than others. Full sets in pinks or blues are generally priced higher. Though you may have a problem finding full sets, you can start collecting it inexpensively by piecing sets together.