"... so he painted one on his garage door."

ADDED: It's a pretty standard idea for a mural: Make it look like the wall you're painting isn't there — fool the eye into seeing something inside. Here are a bunch of examples of that.
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ADDED: It's a pretty standard idea for a mural: Make it look like the wall you're painting isn't there — fool the eye into seeing something inside. Here are a bunch of examples of that.