Math Monday: What to Make from Binder Clips?

Binder clips are one of the office supplies that aren't always appreciated for their mathematical possibilities. Where many people see little architectural potential, Zach Abel has been pushing forward the boundaries of binder clip assembly research and offers a number of novel constructions. Read more »

Math Monday: Four Paper Triangles

What could sound easier than to make a regular construction from four paper equilateral triangles? One possible construction is the regular tetrahedron, which is pretty easy. Here is a different construction from four equilateral triangles. Each triangle is linked with the other three, like two links of a chain. Read more »

Math Monday: An Octahedron in a Balloon

You may know how to make a ship in a bottle, but how would you make this octahedron in a balloon? The twelve edges of the octahedron are made of strips of blue balloon rubber, glued to the inside of the clear balloon at the six vertices. Think of how... Read more »

Math Monday: Light Stick Construction

Inexpensive light sticks can be held together with rubber bands to make glowing geometric structures. Here's a construction based on the truncated dodecahedron, with a tetrahedron over each triangle. Assembling it is a fun group activity. Read more »

Math Monday: String Hyperboloid

A string hyperboloid can be made by running strings between two circles and rotating one relative to the other. Here's one large enough to stand inside of---it is fourteen feet high---between four-foot diameter circles. Read more »