[deutsche Version]

How to sew a three-holed cloth torus

It's obvious how to sew one-holed or two-holed tori. This page treats the three-holed torus.

A one-holed torus arises by identifying a rectangle's sides, a two-holed torus arises by identifying an octagon's sides. Then it's not surprising that a three-holed torus arises by identifying a dodecagon's sides in the following way.

The used tools:

• a large piece of material (about 40x40 in²)
• needle and thread
• to construct or draw the dodecagon:
  • a pair of compasses and a ruler --- or
  • ruler, pocket calculator and a sheet of paper
• stuffing
• a few hours of free time
• unfortunately I don't know which CD I heard during sewing

Construct (or draw) and then cut the dodecagon:

A lot of sewing has to be done but after the first hole ...

... it's a short way to the three-holed cloth torus:

For friends of jpegs: the little 3-holed-cloth-torus-gallery.