Earlier this week for my lunch one day, I hacked an OpenSCAD module that created perf. Today I tried hack one that creates triangular perf. This is a challenge. Triangular perf requires an equilateral triangle that is hard to achieve in OpenSCAD. Also each triangle is vertically inverted from its neighbors on all four sides creating a pattern that is very pleasing to the eye. I came a long way and pondered it heavily during my commute home. Perhaps next week I can master it.