Let us begin by revisiting the different types of wallpaper repeating
patterns that we began discussing yesterday. Mathematicians classify certain
prints as really being different variations on the *same *pattern, and
they count a certain number of pattern types.

Can you guess how many?

Without worrying too much about some of the fancy math language on the site
we are about to see, let us go take a
look.

Although this server spends a lot of time offline, when it is up it holds
a large amount of math
info and resources. It may be of some help with the geometry we will be
discussing today . . .

For the next activity, let us look at one use of geometry that combines astronomy with religion, and dates back quite a ways . . .

Some math graphics are here. They are not directly related to what we have been doing, but if you like knots . . .

For those people who are in my

Here are a few more things to play with. Don't blame me if it turns your brains to tofu . . .

- The 600-cell (coming soon: other 4-polytopes?)
- Tessellations of the Flat Pseudo-sphere
- Some Geometric pictures and generators
- A Visual Dictionary of certain plane curves

(Last updated 6/25/96)