Ключевые слова: abstract, annular, apart, art, background, bluff, center, circularly, concentric, deceptive, delusion, endless, expanding, eyesight, fallacy, fly, illusion, illustration, imagination, meditation, middle, motion, movement, moving, optical, purple, rings, rotation, round, see, seeming, shapes, spin, spiral, surface, trick, visual, visually, yellow,