That's Impossible!

Can a staircase really lead upward forever, or can a fish swim against a current that seems to flow the wrong way? Optical illusions tap into the way our sight and brain interpret what we see, so a picture that looks convincing at first can seem strange on a second look. This book shows how these images can fool the eye.

Readers will examine a variety of puzzling pictures and learn the science that explains why each one works. The book then invites young readers to create an optical illusion of their own.