Ключевые слова: abstract, art, backdrop, background, battle, black, block, board, brain, checkerboard, chess, chessboard, cognitive, competition, contrast, decoration, decorative, design, effect, empty, game, geometric, geometry, graphic, gray, grid, illusion, intelligence, intersections, leisure, line, magic, optical, ornament, pattern, piece, play, shape, sport, square, surface, system, table, texture, think, tile, trick, wallpaper, white,