Summary A building block to eventually build out into a construction system. Based on wooden joinery found on pinterest (http://www.woodworkerz.com/kawai-tsugite/). Joins either straight or in either of two right angles. kawai tsugite Instructions Playing with a design based on wooden joinery (Original http://www.woodworkerz.com/kawai-tsugite/). Will eventually build out a set of building blocks, but for now there's just the one 8x1x1, double-ended with a quarter twist block. Fits together pretty snugly even though my printer didn't quite get the dimensions even. The model is correct, and I'm sure someone with more printing experience could get a snugger fit.