var category_matrix = { "Pottery & Porcelain" : { "period" : [ "17th Century", "18th Century", "1930s", "1950s", "19th Century", "20th Century", "Art Deco", "Art Nouveau", "Arts & Crafts", "Arts and Crafts", "Edwardian", "Majolica", "Victorian", "Yung Cheng" ], "form" : [ "Animal", "Art Glass", "Automaton", "Book", "Bowl", "Box", "Button", "Cabinet", "Coffee set", "Cup", "Cups", "Drawing", "Figure", "Figurine", "Frame", "Humidor", "Jar", "Jug", "Lamp", "Lunch Service", "Mug", "Pitcher", "Plaque", "Plate", "Pot", "Sculpture", "Service", "Table", "Tea set", "Teapot", "Terrine", "Tile", "Urn", "Vase", "Vessel" ], "material" : [ "Bisque", "Bronze", "Ceramic", "Clay", "Copper", "Earthenware", "Enamel", "Glass", "Guache", "Ink", "Iridescent", "Ivory", "Lapis Lazuli", "Lustreware", "Majolica", "Metal", "Paint", "Paper", "Pine", "Porcelain", "Pottery", "Quartz", "Rosewood", "Shell", "Stone", "Stoneware" ] }, "Science & Technology" : { "period" : [ "19th Century", "20th Century", "Art Deco" ], "form" : [ "Appliance", "Automaton", "Cabinet", "Drawing", "Jug", "Medical", "Model", "Music box", "Musical Toy", "Sign" ], "material" : [ "Aluminum", "Bakelite", "Brass", "Glass", "Metal", "Oak", "Paper", "Walnut", "Watercolor", "Wood" ] }, "Collectibles" : { "period" : [ "1930s", "1940s", "1950s", "1960s", "1970s", "19th Century", "20th Century", "Art Nouveau" ], "form" : [ "Advertisement", "Animal", "Animation Cel", "Animation Cell", "Archive", "Art", "Autograph", "Award", "Bank", "Black and White", "Book", "Button", "Cabinet", "Calendar", "Card", "Chromolithograph", "Clothes", "Clothing", "Comic drawing", "Comic figure", "Diary/Journal", "Document", "Doll", "Drawing", "Electric Guitar", "Ephemera", "Figure", "Hat", "Illustration", "Landscape", "Letter", "Lighter", "Lithograph", "Log", "Lunch Kit", "Magazine", "Maquette", "Mask", "Movie Memorabilia", "Mug", "Necklace", "Painting", "Photo", "Photograph", "Portrait", "Poster", "Record Album", "Script", "Sculpture", "Sign", "Silk Screen", "Sketch", "Toy", "Tray", "Weaving", "lighter" ], "material" : [ "Aluminum", "Cardboard", "Cast Iron", "Celluloid", "Ceramic", "Cloth", "Fiberglass", "Glass", "Gold", "Ink", "Latex", "Leather", "Metal", "Mixed Media", "Paper", "Pastel", "Plastic", "Porcelain", "Rubber", "Silk", "Synthetic", "Tin", "Vinyl", "Watercolor", "Wood" ] }, "Metalwork & Sculpture" : { "period" : [ "18th Century", "1930s", "19th Century", "20th Century", "Art Deco", "Arts and Crafts", "Impressionism", "Modern", "Modernist", "Victorian" ], "form" : [ "Animal", "Book", "Candlestick", "Casting", "Desk Set", "Figure", "Lamp", "Maqette", "Ornament", "Plaque", "Sculpture", "Statue", "Trophy", "Vase" ], "material" : [ "Beads", "Brass", "Bronze", "Copper", "Enamel", "Glass", "Gold", "Ivory", "Marble", "Metal", "Paint", "Plaster of Paris", "Silver" ] }, "None Listed" : { "period" : [ ], "form" : [ ], "material" : [ ] }, "Folk Art" : { "period" : [ "18th Century", "19th Century", "20th Century" ], "form" : [ "Animal", "Bowl", "Box", "Cane", "Carving", "Chest", "Desk", "Drawing", "Embroidery", "Frame", "Illustration", "Jar", "Jug", "Miniature", "Needlework", "Painting", "Pendant", "Photograph", "Plaque", "Portrait", "Quilt", "Sampler", "Scrimshaw", "Sculpture", "Sign", "Walking stick", "Watercolor", "Whirligig" ], "material" : [ "Ash", "Bone", "Cherry", "Clay", "Cloth", "Cotton", "Elm", "Glass", "Horn", "Ink", "Iron", "Ivory", "Koa Wood", "Leather", "Metal", "Paint", "Paper", "Pastel", "Pewter", "Pottery", "Sand", "Sequin", "Silk", "Stoneware", "Textile", "Thread", "Tin", "Tooth", "Tusk", "Walnut", "Watercolor", "Wood", "Wool" ] }, "Photographs" : { "period" : [ "19th Century", "20th Century" ], "form" : [ "Archive", "Autograph", "Black and White", "Fine art photography", "Landscape", "Nature photography", "Photograph", "Portrait" ], "material" : [ "Cloth", "Modernism", "Paper", "Silver", "Silver bromide", "Silver iodide" ] }, "Tribal Arts" : { "period" : [ "19th Century", "20th Century", "No Periods Defined", "No period defined", "Pre-Columbian" ], "form" : [ "Animal", "Archive", "Bag", "Basket", "Blanket", "Bowl", "Box", "Calendar", "Carving", "Clothes", "Cradle", "Doll", "Drawing", "Figure", "Helmet", "Jar", "Mask", "Moccasin", "Painting", "Pipe", "Portrait", "Pot", "Rifle", "Rug", "Saddle", "Sculpture", "Sword", "Tool", "Vessel", "Weaving" ], "material" : [ "Aniline", "Baleen", "Beads", "Bone", "Cloth", "Composite", "Feather", "Horn", "Ivory", "Koa Wood", "Lacquer", "Leather", "Metal", "Paint", "Papier-mâché", "Pottery", "Silk", "Silver", "Stone", "Vinyl", "Wood", "Wool", "Yarn" ] }, "Paintings & Drawings" : { "period" : [ "18th Century", "1930s", "1950s", "1960s", "19th Century", "20th Century", "Art Deco", "Expressionism", "Impressionism", "Modernism", "Victorian" ], "form" : [ "Animal", "Comic figure", "Drawing", "Etching", "Frame", "Illustration", "Landscape", "Lithograph", "Miniature", "Painting", "Portrait", "Seascape", "Sketch", "Sketchbook", "Still Life", "Trompe L'oeil", "Watercolor", "Woodcut" ], "material" : [ "Artist's Board", "Canvas", "Gouache", "Graphite", "Guache", "Impasto", "Ink", "Ivory", "Landscape", "Masonite", "Mixed Media", "No material defined", "Oil", "Paint", "Painting", "Paper", "Pastel", "Tempura", "Watercolor" ] }, "Rugs & Textiles" : { "period" : [ "16th Century", "17th Century", "18th Century", "19th Century", "20th Century", "Art Deco", "Victorian" ], "form" : [ "Bag", "Bandana", "Carpet", "Clothes", "Clothing", "Cover", "Dress", "Embroidery", "Frame", "Oriental Rug", "Panel", "Quilt", "Rug", "Shoes", "Tapestry", "Weaving" ], "material" : [ "Beads", "Ceramic", "Cloth", "Cotton", "Fur", "Leather", "Linen", "Paper", "Silk", "Silver", "Textile", "Thread", "Walnut", "Wool" ] }, "Furniture" : { "period" : [ "17th Century", "18th Century", "1940s", "1950s", "1970s", "19th Century", "20th Century", "Aesthetic", "Arts & Crafts", "Arts and Crafts", "Baroque", "Early Federal", "Egyptian Revival", "Federal", "Modern", "Neoclassical", "Regency", "Romantic", "Victorian" ], "form" : [ "Animal", "Bench", "Bookcase", "Bureau", "Cabinet", "Card Table", "Cellarette", "Chair", "Chaise Longue", "Chest", "Chest of drawers", "Chest on chest", "Compass", "Corner Cabinet", "Desk", "Document", "Dresser", "Etagere", "Grandfather Clock", "Highboy", "Lamp", "Lowboy", "Maple", "Miniature", "Music box", "Needlework", "Organ", "Painting", "Photograph", "Pie Safe", "Portrait", "Poster", "Rocker", "Secretary", "Side Chair", "Sideboard", "Sofa", "Spice Box", "Table", "Tall Case Clock", "Tea Table" ], "material" : [ "Aluminum", "Antler", "Ash", "Birch", "Brass", "Bronze", "Cast Iron", "Cedar", "Cherry", "Chest on chest", "Chestnut", "Clay", "Cloth", "Copper", "Cypress", "Daguerreotype", "Glass", "Gold", "Hickory", "Highboy", "Iron", "Leather", "Mahogany", "Maple", "Marble", "Metal", "Oak", "Ormolu", "Paint", "Paper", "Pewter", "Pine", "Poplar", "Porcelain", "Redwood", "Rosewood", "Silk", "Silver", "Spruce", "Tiger Maple", "Walnut", "Watercolor", "Wood" ] }, "Glass" : { "period" : [ "1930s", "1940s", "19th Century", "20th Century", "Art Deco", "Art Nouveau", "Arts and Crafts", "No Periods Defined" ], "form" : [ "Architectural fragment", "Art Glass", "Bottle", "Bowl", "Compote", "Document", "Ewer", "Floor Lamp", "Glass", "Jar", "Lamp", "Painting", "Panel", "Pitcher", "Sculpture", "Shade", "Tile", "Vase" ], "material" : [ "Brass", "Bronze", "Copper", "Cut Glass", "Enamel", "Gilded", "Glass", "Green Iridescent", "Iridescent", "Leaded Glass", "Masonite", "Metal", "Oil", "Pressed Glass", "Silver", "Stained Glass", "Wood" ] }, "Toys & Games" : { "period" : [ "1930s", "1940s", "1950s", "1960s", "19th Century", "20th Century" ], "form" : [ "Action figure", "Advertisement", "Animal", "Bank", "Box", "Car", "Comic Figure", "Comic figure", "Dolls House", "Figure", "Game", "Gun", "Lithograph", "Model", "Motorcycle", "Music box", "Original Box", "Peddle Car", "Play Set", "Pull Toy", "Robot", "Stuffed Bear", "Toy", "Train", "Truck", "Vehicle", "Wind-up Toy" ], "material" : [ "Cardboard", "Cast Iron", "Celluloid", "Cloth", "Composite", "Excelsior", "Glass", "Goat hair/Mohair", "Metal", "Paper", "Plaster of Paris", "Plastic", "Steel", "Tin", "Wood" ] }, "Jewelry" : { "period" : [ "18th Century", "1940s", "1950s", "19th Century", "20th Century", "Art Deco", "Art Nouveau", "Arts and Crafts Movement", "Edwardian", "Georgian", "Rococo", "Victorian" ], "form" : [ "Advertisement", "Animal", "Box", "Bracelet", "Brooch", "Button", "Cameo", "Chain", "Cufflink", "Diamonds", "Earrings", "Gold", "Jewelry", "Magazine", "Micromosaic", "Necklace", "Pearl", "Pendant", "Pin", "Pocket Watch", "Purse", "Ring", "Saphire", "Watch" ], "material" : [ "Amethyst", "Bakelite", "Black Onyx", "Citrine", "Cloth", "Coral", "Diamonds", "Emerald", "Enamel", "Glass", "Gold", "Ivory", "Jade", "Lapis Lazuli", "Leather", "Lucite", "Metal", "Opal", "Paper", "Pearl", "Plastic", "Platinum", "Porcelain", "Quartz", "Ruby", "Sapphire", "Silver", "Steel", "Topaz" ] }, "Clocks & Watches" : { "period" : [ "18th Century", "1940s", "19th Century", "20th Century", "Arts and Crafts", "Victorian" ], "form" : [ "Archive", "Bracelet", "Bracket Clock", "Chain", "Chamber Clock", "Clock", "Lantern Clock", "Mantel Clock", "Movement", "Pedestal Clock", "Pocket Watch", "Shelf Clock", "Wall Clock", "Watch", "Wrist Watch" ], "material" : [ "Brass", "Bronze", "Diamond", "Diamonds", "Enamel", "Gilded", "Glass", "Gold", "Leaded Glass", "Mahogany", "Metal", "Oak", "Ormolu", "Paint", "Pearl", "Porcelain", "Rock Crystal", "Silver", "Steel", "Stone", "Walnut", "Wood" ] }, "Asian Arts" : { "period" : [ "17th Century", "18th Century", "19th Century", "20th Century", "China Trade Period", "Edo", "Meiji", "Ming Dynasty", "Qing Dynasty", "Tang Dynasty" ], "form" : [ "Animal", "Bottle", "Bowl", "Box", "Carving", "Clothes", "Clothing", "Desk", "Dish", "Document", "Figure", "Helmet", "Knife", "Mirror", "Necklace", "Needlework", "Painting", "Panel", "Plaque", "Plate", "Pot", "Pottery", "Print", "Rifle", "Scrimshaw", "Sculpture", "Statue", "Sword", "Table", "Teapot", "Tool", "Urn", "Vase", "Vessel", "Weapon", "Woodcut" ], "material" : [ "Bisque", "Bone", "Brass", "Bronze", "Ceramic", "Cloisonn", "Cloisonn ", "Cloisonne ", "Cloth", "Copper", "Earthenware", "Enamel", "Felt", "Glass", "Gold", "Guache", "Ink", "Inlay", "Iron", "Ivory", "Jade", "Lacquer", "Landscape", "Marble", "Metal", "Paper", "Pearl", "Porcelain", "Pottery", "Rice Paper", "Rosewood", "Silk", "Silver", "Walnut", "Watercolor", "Wood" ] }, "Dolls" : { "period" : [ "18th Century", "1930s", "19th Century", "20th Century" ], "form" : [ "Automaton", "Bisque Head Doll", "Clothes", "Clothing", "Comic figure", "Doll", "Doll Clothes", "Dolls Furniture", "Ephemera", "Musical Toy", "Original Box", "Stuffed Animal", "Stuffed Bear", "Stuffed Doll", "Truck", "Wind-up Toy" ], "material" : [ "Aluminum", "Bisque", "Cloth", "Composite", "Cotton", "Enamel", "Glass", "Goat hair/Mohair", "Ivory", "Leather", "Metal", "Paint", "Paper", "Porcelain", "Wood" ] }, "Silver" : { "period" : [ "17th Century", "18th Century", "18th century", "19th Century", "20th Century", "Art Deco", "Art Nouveau", "Roccoco" ], "form" : [ "Animal", "Bottle", "Bowl", "Box", "Coffee Pot", "Coffee set", "Cup", "Decanter", "Desk Set", "Dish", "Dresser Set", "Epergne", "Jug", "Miniature", "Pitcher", "Plate", "Salver", "Service", "Tea Set", "Teapot", "Tray", "Trophy", "Tureen", "Vase" ], "material" : [ "Brass", "Coin Silver", "Cut Glass", "Glass", "Jade", "Mahogany", "Rosewood", "Silver", "Sterling", "Wood" ] }, "Musical Instruments" : { "period" : [ "18th Century", "1930s", "1950s", "1960s", "19th Century", "20th Century", "No period defined" ], "form" : [ "Acoustic Guitar", "Advertisement", "Amp", "Banjo", "Bow", "Case", "Drum", "Electric Guitar", "Flute", "Harp", "Mandolin", "Steel Guitar", "Stringed Instrument", "Trumpet", "Ukulele", "Violin" ], "material" : [ "Baleen", "Brass", "Celluloid", "Gut", "Ivory", "Koa Wood", "Maple", "Metal", "Paper", "Pearl", "Pearloid", "Plastic", "Rosewood", "Silver", "Spruce", "Tiger Maple", "Wood" ] }, "Decorative Arts" : { "period" : [ "18th Century", "1930s", "19th Century", "20th Century", "Aesthetic", "Art Deco", "Regency", "Rococo", "Victorian" ], "form" : [ "Animal", "Archive", "Basket", "Box", "Bust", "Carving", "Casting", "Chair", "Chest", "Collage", "Cutlery", "Desk", "Diary/Journal", "Drawing", "Embroidery", "Ephemera", "Fan", "Figure", "Frame", "Ink Well", "Knife", "Mask", "Miniature", "Mirror", "Model", "Mosaic", "Needlework", "Photo", "Photograph", "Plaque", "Purse", "Sampler", "Scrimshaw", "Sculpture", "Sewing Box", "Tea Caddy", "Tile", "Urn", "Weathervane" ], "material" : [ "Bead", "Bone", "Brass", "Bronze", "Carved", "Cast Iron", "Ceramic", "Cloth", "Coral", "Enamel", "Feathers", "Glass", "Gold", "Guache", "Inlaid", "Ivory", "Jade", "Mahogany", "Marble", "Metal", "Paper", "Papier-mâché", "Pine", "Plaster of Paris", "Plastic", "Porcelain", "Shell", "Silk", "Silver", "Stone", "Thread", "Tusk", "Watercolor", "Wood" ] }, "Books & Manuscripts" : { "period" : [ "16th Century", "17th Century", "18th Century", "1930s", "1960s", "19th Century", "20th Century", "Civil War", "First World War (WWI)", "Renaissance", "Revolutionary War", "Second World War (WWII)", "Victorian" ], "form" : [ "Advertisement", "Animal", "Archive", "Atlas", "Autograph", "Banner", "Book", "Bracelet", "Chair", "Chromolithograph", "Diary/Journal", "Directory", "Document", "Drawing", "Folio", "Illustration", "Ledger", "Letter", "Magazine", "Map", "Miniature", "Painting", "Photo", "Photograph", "Portrait", "Print", "Ring", "Script", "Sketchbook", "Surveying equipment", "Woodcut" ], "material" : [ "Cloth", "Cotton", "Glass", "Gold", "Illustration", "Ink", "Leather", "Metal", "Paper", "Vellum", "Watercolor", "Wood" ] }, "Prints & Posters" : { "period" : [ "15th Century", "16th Century", "17th Century", "18th Century", "1940s", "1950s", "1960s", "19th Century", "20th Century", "Art Deco", "Art Nouveau", "Arts & Crafts", "Arts and Crafts", "Expressionism", "First World War (WWI)" ], "form" : [ "Advertisement", "Animal", "Atlas", "Book", "Chromolithograph", "Document", "Engraving", "Ephemera", "Etching", "Frame", "Lithograph", "Map", "Maqette", "Maquette", "Movie Memorabilia", "Photo", "Poster", "Print", "Selfportrait", "Woodcut" ], "material" : [ "Cloth", "Guache", "Ink", "Leather", "Linen", "Oil", "Paper" ] }, "Tools & Implements" : { "period" : [ "18th Century", "19th Century", "19th century", "20th Century" ], "form" : [ "Chest", "Drill Bit", "Medical", "Plane" ], "material" : [ "Metal", "Steel", "Wood" ] }, "Sports Memorabilia" : { "period" : [ "1930s", "1940s", "1950s", "19th Century", "20th Century", "First World War (WWI)" ], "form" : [ "Archive", "Autograph", "Baseball", "Baseball Bat", "Baseball Card", "Basketball", "Black and White", "Book", "Boxing Gloves", "Clothing", "Document", "Football", "Golf Club", "Jersey", "Letter", "Lifetime Pass", "Medal", "Memorabilia", "Photo", "Photograph", "Pocket Watch", "Print", "Ring", "Ticket", "Train", "Trophy", "Wrist Watch" ], "material" : [ "Cloth", "Gold", "Ink", "Leather", "Metal", "Paper", "Rubber", "Silver", "Watercolor", "Wood" ] }, "Antiquities" : { "period" : [ "19th Century", "Before Christ (BC)" ], "form" : [ "Bowl", "Carving", "Container", "Figure", "Rattle", "Sculpture" ], "material" : [ "Bronze", "Cedar" ] }, "Arms & Militaria" : { "period" : [ "18th Century", "19th Century", "20th Century", "Civil War", "First World War (WWI)", "French Indian War", "Mexican-American War", "Second World War (WWII)", "Spanish American War", "War of 1812" ], "form" : [ "Animal", "Archive", "Autograph", "Belt", "Belt Buckle", "Book", "Box", "Bugle", "Button", "Canteen", "Carving", "Case", "Clothing", "Document", "Drum", "Flag", "Hat", "Helmet", "Knife", "Ledger", "Letter", "Log", "Medal", "Model", "Photo", "Photograph", "Pistol", "Portrait", "Powder Horn", "Revolver", "Ribbon", "Rifle", "Saber", "Scabbard", "Shot Gun", "Shoulder Board", "Sketch Book", "Spear", "Spurs", "Sword", "Tomahawk", "Uniform" ], "material" : [ "Ambrotype", "Beech", "Bone", "Brass", "Bronze", "Cedar", "Cloth", "Cotton", "Gold", "Horn", "Iron", "Leather", "Maple", "Metal", "Paint", "Paper", "Portrait", "Silk", "Silver", "Steel", "Tiger Maple", "Tin", "Tin Type", "Topaz", "Vellum", "Wood", "Wool" ] } }