PIE is “Playful Invention and Exploration” - or integrating engineering with artistic expression. Their web page is a treasure chest for any maker.

Lightplay. This is one of their awesome art projects. Also try “marble machines”, the animations on the page are a joy to watch.
The Light Traces I did together with Amy Snyder are featured in the San Francisco Chronicle today (06/09/07)! The front page article talks about the science of pitching and has a few cool and definitely funny light traces pictures in it! Here is the link: A neophyte takes on the science of pitching
Have a look at our Light Traces of Baseball featuring Dave Barker (he is my coach).Baseball gallery
Read more: How to make Light Traces
Baseball is the focus of the next Exploratorium Quarterly (July 2007)! Have a look at Light Traces of Baseball featuring Dave Barker (he is the explOratorium’s baseball expert). 
Read more: How to make Light Traces

Making waves and making waves disappear, using only paper and coffee stirs. An elegant paper model showing constructive and destructive interference, my first invention at the Exploratorium. DocFile