This time fountain uses strobe lighting to show water droplets falling. You can interact with the drops and because you can alter the strobing frequency, you can seem to slow down time and even make time go backwards.
The video makes things clearer 🙂 you can find that here

Instructions on how to make the time fountain yourself here

There are plenty of other creations on the site. Another one that got my attention was the walluminate – a wallet with LEDs that come on when you open the wallet.

The plant reaction is a wonderful contraption as well.

One of the other things I found was the Make My Day DVD which apparently is a DVD set up like a Steve Jackson book – ie. you get to choose what the hero does periodically, allowing up to 13 different endings to the film. At $16,- it’s a great deal!

Cool site to browse around on.