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Old 02-02-2012, 04:32 PM   #12
Wombat
(marsupial with backward-facing pouch)
 
Join Date: Oct 2004
Location: Canberra
Posts: 251
A pane of window glass does cast a shadow, just a very faint one (roughly 10% of the light doesn't make it through).

Maybe the answer is the Sun?
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