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Some of my childhood was spent in the Santa Cruz Mountains of California. I have fond memories of tie-dye parties and playing in the woods--of mist rising from the redwood "fences" in the morning.

But one of my favorite things to do was to make sunprints. Other than my lightbrite, this is toy made the biggest impression on my young mind. They're very simple, really--light sensative paper that fixes with water. You place a leaf, or other object on the paper, cover it with glass, and leave it in the sun for a few minutes. Then you rinse it off with water. I just couldn't get enough of this stuff.

I just found it again! Sunprint® Kits

These were developed by Lawrence Hall of Science, across the Bay from San Francisco.