the eye and mind are funny things. they can see and conceive of objects that could never exist in a three-dimensional world like the drawings of m.c. escher and robert penrose's tribar a triangle with the corners at impossible angles to each other. bruno errnst explores the science and people behind optical illusions and impossible objects especially escher in impossible worlds a two-in-one book that includes ernst's adventures with impossible objects and optical illusions. impossible worlds is filled with drawings and paintings that are guaranteed to twist your eyes hurt your head and stimulate your mind. english. softcover. 95 pages. 9.1"w x 11.8"l.