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The Book of Holes is a picture book, written and illustrated by Poul Lange, about—you guessed it—holes. The original print edition (Gyldendal, Copenhagen 2006) has a hole all the way through it.
The newest version of The Book of Holes is an iPad app, published by Chocolate Factory Publishing, filled with interactive fun, games and animations.
It was awarded a star by the prestigious Kirkus Review.