1)   Golden Rectangular Solid 1.0
Visualize a 3-dimensional golden-rectangular-solid that is analagous to the 2-dimensional golden-rectangle, which can be sub-divided recursively so that each left-over rectangular solid has the same proportions as the original rectangle.
math, mathematics, phi, golden, rectangle, golden-rectangle, embed, embedded, sequence, series,

 2)   Cosmic Heart 1.0
This application demonstrates the curious relationships wherein a tetrahedron can be inscribed in a cube in two different ways and a cube can be inscribed in a dodecahedron in 5 different ways.
math, mathematics, polygon, polyhedra, tetrahedron, cube, dodecahedron, phi, inscribe, circumscribe,