Illusion

Today I read a book about illusions and on the back page I saw a president Abraham Lincoln and when you flip the book it turns into the bald eagle {American country animal}. Also I saw a circle turn when I moved the book. The book truely tricked my brain. I looked at many different ones too, like you can read words only at eye level or a pig but looks like a shark when turned over. It was so amazing I could not belive what my brain told me, when I looked in mirror with the book the words that were wrong turned right! FUN UH!