A polyhedron is Rupert if you can cut a hole in it that’s large enough for an identical polyhedron to fit through. I’ve talked about the Rupert tetrahedron, the Rupert cube and the Rupert octahedron. Today it’s the dodecahedron.

Continue reading Rupert Polyhedra: Dodecahedron# Tag Archives: 3D geometry

# The Carpeted Hexaflake

I’m trying to imagine a solid. From the front, it looks like a Koch snowflake. From the top, it looks like a Sierpinski carpet. How might it look from the side? How would it feel? Is it even possible?

Continue reading The Carpeted Hexaflake# Cube Shadows

Drag the sliders to rotate the cube and see how its shadow changes.

Continue reading Cube Shadows# Rupert Polyhedra: Octahedron

A polyhedron is Rupert if you can cut a hole in it that’s large enough for an identical polyhedron to fit through. I’ve already talked about the Rupert tetrahedron and the Rupert cube. Now it’s the turn of the octahedron.

Continue reading Rupert Polyhedra: Octahedron# Rupert Polyhedra: Cube

Last week, I wrote about Rupert polyhedra, and how a tetrahedron has the Rupert property. The idea dates back to the 1600s, when Prince Rupert of the Rhine won a bet that it was possible to make a hole in a cube that was large enough for an identical cube to pass through, so let’s look at how the Rupert property works for a cube.

Continue reading Rupert Polyhedra: Cube# Rupert Polyhedra: Tetrahedron

For a polyhedron to be classed as Rupert, it must be possible to cut a hole in it that is large enough for an identical polyhedron to pass through. It sounds impossible, but many polyhedra have this property, including the tetrahedron.

Continue reading Rupert Polyhedra: Tetrahedron