A creative sandbox world with various kinds of extensions for 2-way flying machines. There is one example built from each possible family of 2-way extensions (of which there are 7). There's also a sort of pictograph system I made to visualize why there are exactly 7 families of 2-way extensions. This had to do partly with quasi-connectivity so there's also a diagram showing how quasi-connectivity changes if you rotate slimestone devices in certain ways.