Eye Twisters Book 2007 Eye Twisters BP Burkard Polster 2 readers PublisherConstablePublished2007 Pattern perceptionVisual perceptionOptical illusions in artOptical illusionsWord gamesPuzzles
Sciencia: Mathematics, Physics, Chemistry, Biology, and Astronomy for All (Wooden Books) Sciencia: Mathematics, Physics, Chemistry, Biology, and Astronomy for All (Wooden Books) 5.01 2011