Rectangle and Square Flagstone
This origami tessellation is built from the same kind of molecule as Pythagorean Tiling (flic.kr/p/2jDNGv3) but molecules are arranged in a different way: in any pair of adjacent neighbors, each has a different direction of rotation (chirality). This different layout results in a significant change to the way the complete model looks.
Designed by myself, and independently by many people before me (see the description of Pythagorean Tiling in my stream for some examples).
This model is the starting point for my Woven Triangles tessellation series (see flic.kr/s/aHsmQycPyh).