Powdies might be interested in this link:

http://en.wikipedia.org/wiki/Image:Universum.jpg

It's to an image that appears on the "Earth, Sun and Moon" album (in
different colours?).

Wikipedia refers to it as the "Flammarian woodcut".  It may be about a
pilgrim finding the place where the Earth and sky meet.

A caption reads:

"What, then, is this blue sky, which certainly does exist, and which
veils from us the stars during the day?"

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