Number of units: 12 (4 colors, 3 pieces per color).

Designer: Tung Ken Lam

Instructions: Here. You may also checkout Youtube videos for WXYZ. To get started with models like WXYZ, check out How to Make Intersecting Plane Models.

Comments: This model is quite easy to fold and to assemble. In fact, I recommend that WXYZ should be the first 'Modular Origami' model that a beginner should fold. Took me about half an hour to finish. The overall design is `four intersecting triangles', one triangel per color. Each triangle is in a plane.