Ключевые слова: abstract, amazing, complexity, concept, construct, creativity, endless, escher, esher, eternity, fantasy, forever, geometric, geometrical, geometry, horizontal, icon, illusion, illustration, imagination, infinity, loop, magic, mathematics, mental, mobius, optical, order, originally, perception, problems, science, scientific, sensory, shape, sign, symbol, technical, technology, thinking, three dimensional, trick, trickery, visual,