Try this for yourself, it is really weird.
A shadow is caused by light being blocked by an object, right? And we see things because light reflects off of them and into our retinas. So why are bubbles transparent (or glass, for that matter) yet they still cast a shadow? This works in and out of water, so light refraction isn't the answer.
[Edited on 11.04.2010 1:22 PM PDT]
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[quote][b]Posted by:[/b] Dropship dude Glasses also cast a shadow. I'm assuming it's something to do with the glass refracting or reflecting the light (same goes for the surface of the bubbles), causing less light to travel directly through, resulting in a shadow.[/quote]I've never seen glass cast a shadow