Ключевые слова: abstract, annual, article, background, bag, black, chute, circle, crater, curve, design, filler, funnel, futuristic, geometry, graph, graphic, helix, illusion, illustration, mathematical, mathematics, op, optical, pattern, ribs, ring, striated, striped, tabby, tonel, tonnel, torus, tunnel, white, worm, wormhole,