Ключевые слова: 3d, abstract, amazing, black, black and white, border, cube, design, element, emblem, endless, escher, eternity, fantasy, figure, frame, geometric, graphic, gray, icon, illusion, impossible, infinity, isometric, knot, line, line art, linear, loop, magic, mobius, object, optical, optical illusion, pictogram, rhombus, shape, square, swirl, symbol, unreal, visual,