Ключевые слова: abstract, art, backgrounds, black, colorful, computer, cube, cubicle, decoration, design, endless, experiment, eyesight, frame, geometric, graphic, gray, illusion, illustration, imagine, impossible, instrument, item, join, loop, magic, novelty, optic, optical, optician, originally, paper, pattern, psychiatrist, shape, strip, swirl, symbol, technical, test, think, three dimensional, triangle, trickery, vibrant, vibration, wall, wallpaper, white,