I’ve used this variation in my last two prompt challenge words. I got the idea from Jeannine, who said she “start(s) with 2 straight folds (horizontal and vertical) and only one diagonal.” Here’s how to fold it — in the fourth step below, reverse the crease on the diagonal fold to get a square that is half the size of the original sheet.
I took 4 folded sheets and glued them to a backing sheet to get this:
Gluing the folded sheets back-to-back, and rotating each sheet 180 degrees as you glue, like the picture on the right, gives you an accordion book that has a wonderful slinky-like action to it. Below is a model I made that I hung up in my studio.
My friend Cathy calls these “Lotus Books,” and she has an example here and more complete instructions in this PDF.
Susan Kapuscinski Gaylord calls them “diamond fold books” and she has more examples on her website.
All my posts on Turkish Map Folds, the variations and examples can be found here.