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This site provides a rich environment to visualize and explore a variety of mathematical objects and includes Java applets, Quicktime movies and pdf descriptive documents of the mathematics involved in the objects displayed. It will reward considerable exploration but is not for the mathematically faint of heart.
I spent about a half hour browsing through the various galleries and watching the animations.
This site provides you with a very clear view of what exactly shapes like A deltoid and an astroid are and how the calculations draw them out on an X ,Y axis.
This site would be very useful for a geometry class. Rather than looking at a static image on the board, pulling this up on the overhead will give students a more in depth look at how exactly these shapes are formed.
The site is very intuitive. If you have the skills to navigate to the page then watching the animations will be no problem for you.