In this book you will observe some very creative ambiguous figurative illusions by Humberto Machado where both aspects share space, and cannot exist without the other. Ambiguous illusions are fascinating because they remind us of the discrepancy and reality. These illusions occur as a result of how information is interpreted in the brain. At the end of the book you will come across some famous optical illusions by some very well-known psychologist and physicist like Ewald Hering and Johann Poggendorff.