Flat Stanley by Jeff Brown

Flat Stanley a 1964 children's book by Jeff Brown (1926 – December 3, 2003) and illustrated by Tomi Ungerer. It was the first in a series of books featuring Stanley Lambchop, a completely flat boy.

When Stanley Lambchop wakes up one morning, his brother, Arthur, is yelling. A bulletin board fell on Stanley during the night, and now he is only half an inch thick. Soon, amazing things begin happening to him.