I recently got a little Blizzard Book kit from Green Chair Press. This book structure involves no sewing and no adhesive. All folding. The spine is folded to create little pockets. Then the pages are single sheets which simply slide into the pockets. This Blizzard Book structure was invented by Hedi Kyle - apparently during a blizzard, hence the name.
The kit from Green Chair Press included the materials to make one book, about 4cm x 4cm. Probably the smallest book I've ever made, actually. So not only did I have to wrap my brain around the precise folding process, I also had to get my stubby fingers around those tiny little corners and folds.
At one point I thought I might not get through it, the folding of the spine was not going well at all. But I survived and produced this little book shown here. I like it.