This photo was posted by a teacher who took her own light walk… Notice how all the light patches on the ground are round. That’s because the spaces in the leaves in the trees — though they’re not round — act like pinholes. The round spots are images of the sun. This is true — it’s not just that the light “blurs out” around the edges of the spaces between the leaves. Check out the light walk link above for more information about the weird tricks that you can play with light. It will make you rethink what light — and shadow — is. You can see more of her pix at her Picasa light walk site.
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Exactly – if you look at the same thing during a solar eclipse, you’ll be treated to the bizarre sight of little crescents littering the ground.