'Are you really sure that a floor can't also be a ceiling?' - M. C. Escherpic.twitter.com/WmD8Z0e2TY
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A visual representation of trying to cancel your Sky subscription by phone.
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Oh no! Recursive occlusion!
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Also done in 'Labyrith'. Any others?
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Too bad this didn't happen for Castrovalva. A slightly modest version isn't even that hard to do - mostly involves a tape measure and a box.
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