Flutterfly by Purgatory Pie Press

PPP: “Susan Happersett hand drew her algorithmically generated mapping drawing based on trapezoids. She calls it Trapezoidal Lace. Susan's structure is a Non-Euclidean. It forms a helix built from three rectangles folded to form equilateral triangles. EK Smith Museum Risograph printed Susan's drawings and they folded the books by hand.
“Please NOTE: Risograph printing is very delicate--try not to touch the printed pages, but handle this book by its edges.”