[fafakxpb] A4 city blocks

We consider a city street layout of concentric circles and radial spokes.  Far from the center, city blocks are ro

[unpnxvkf] Unrolling a conic section

Slice off a section of a cone to create a conic section as usual.  Then, cut straight down the side of the cone an

[rllbbgqr] Manifold of multiple polyhedra

Start with a collection of polyhedra and connect pairs of faces like edges in a graph.  You can travel through one

[bywbamay] Day and night on a cubical world

Consider a mostly 2D game which takes place on a large cubical world.  When crossing over to another face, the in-