You guys should see my collection of invisible statues and paintings.
My favorite piece is an homage to the ceiling of the Sistine chapel, shaped in the popcorn ceilings of my living room. It's like the pictures where you cross your eyes and then see a 3d image. One person was so moved they wept, and couldn't uncross their eyes for a few hours. My insurance company won't cover them as they don't insure art by itself, but I've been told it'd be really hard to put a value on them.
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