What is a Book Fold?

The Basic Idea:

Book fold summary

The book fold is a kind of valley fold,
so it is shown by a dashed line.
Sometimes there is an arrow showing the folding direction.
Fold one flap of the paper to the other side of the model,
just like turning a page of a book.

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A traditional fold. Diagrammed by Jasper in 1999.
Copyright 1995-99 by Jasper (aka John Paulsen). Your comments are welcomed.
Last updated October 23, 2004.