While standing in line for the Tram or Terror at Brookfield Zoo, I noticed an interesting illusion created by two spot lights a few feet behind a tree branch. This was totally unintentional, and you had to be in the exact spot to see it, but it was certainly fitting for the Halloween events.
If you moved a couple of feet to the left or right, the tree branch no longer took the shape of a skull, and was simply a branch near two flood lights.
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