The Shrinking of Treehorn
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The Shrinking of Treehorn (ISBN 0823401898) is a book by Florence Parry Heide, illustrated by Edward Gorey and first published in 1971. The main character in the book is Treehorn, a young boy who begins shrinking in height after playing a strange board game. Treehorn's parents fail to notice.
The sequel to this book is Treehorn's Treasure.