Ключевые слова: abstract, arrangement, black, column, columns, different, different size, effect, experiment, figure, form, formation, geometric, geometrical, geometry, graphic, higher, identical, illusion, illustration, influence, irrational, isolated, larger, line, lines, natural, optical, optical illusion, optics, perception, perspective, perspective lines, physiologic, physiological, pillar, pillars, ponzo, ponzo illusion, psychology, same, same size, science, shape, size, smaller, test, visual,