Ключевые слова: abstract, art, backgrounds, black, computer, contrast, decoration, design, escher, experiment, geometric, graphic, gray, illusion, illustration, imagine, instrument, join, loop, magic, mobius, novelty, opart, optical, originally, pattern, psychiatrist, shape, strip, technical, test, think, threedimensional, trickery, vasarely, vibrant, vibration, wall, wallpaper, wave, white,