Google Sketch Up

Intersection of Three Cylinders

Puzzle books I had as a kid often asked what the intersection of three cylinders looked like.  Even looking at the answer in the back, I still had trouble seeing it.  Making this video helped a lot.   The Sketch Up file that I used is available in the 3D Warehouse.

Cube Intersected by a Moving Plane

This is my first Sketch Up video.  It is surprising how many shapes the cross-section of a cube can take on, and how hard they are to visualize (for most of us).   The Sketch Up file I used is in the 3D Warehouse.