h a l f b a k e r y
Like a magnifying lens, only with rocks.
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Black Hole Dome
A dome built from glass in such a way as to distort the view of the sky same way as a black hole would for those who're near it.
The dome would have a lens on its side, to emulate gravitational lensing, with a black filter to simulate the event horizon. People could watch the simulated black hole in the night sky.
Multiworld Dome Array
(kind of related, but simulates possibly habitable worlds near other stars) [Inyuki, Oct 08 2012]
Fully computerized planetarium projectors
[CraigD, Oct 08 2012]
||This is a metaphor for the U.S. budget defecit,
||Cool as gigantic lenses in domes is as an exercise in
lense-grinding, wouldn't it be much more practical
(and, I imagine, fully baked in better planetariums
since at least in mid 1990s) to just project the stars
on a planetarium dome with one of the current
generation fully computerized systems, simulating a
BH however you wish (and can program)?