See my book "Paper Birds" in the Hello Hedi show at 23 Sandy Gallery, Portland

http://23sandy.com/works/products-page/artist-books/paper-birdsI learned this structure from Hedi Kyle at a workshop that I took from her at Haystack School. It is a variation on perfect binding that uses a decorative strip on the spine and over the tops and bottoms of thick pages. This, and other books based on her structures are currently on view at the 23 Sandy Gallery in Portland, Oregon.