Faro Shuffle (in-shuffle)
Doing in-shuffles on a deck of n cards.
Faro Shuffles (Out-Shuffle)
Doing out-shuffles on a deck of n cards.
Cross Sections of Polyhedra
Cutting three dimensional shapes and looking at the possible shapes of the cross section.
Polygons in Polygrams
Each regular polygram has a regular polygon at its center.
Halfing 3D Shapes
Cutting 3D shapes parallel to the base such that the top and bottom resulting portions have the same volume.