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Fulldome
 

Wikpedia entry

"One can even argue that although a hemispherical dome mimics our environment overhead, that is not how we perceive it from a psychological viewpoint. One of the explanations of the Moon illusion (that the Moon looks smaller overhead than it does on the horizon) is that in our minds we don't think of the sky as being a spherical dome, but a flattened "roof" that curves down to the horizon. Thus the Moon looks smaller overhead because since it is overhead, it is perceived to be *closer* to us. If both the overhead and horizon Moons show the same apparent diameter, then the latter must be further away than the former. See for instance Figure 1 in Kaufman & Kaufman's "Explaining the moon illusion" (2000):

http://www.pnas. org/cgi/content/ full/97/1/ 500

Thus although a perfectly hemispherical dome makes it easy to generate artificial immersive environments, it does not match our perceptual expectations of what our environment is like. (If you give much credence to evolutionary psychology, you can take this to mean that our basic perceptual networks were wired when our pre-Australopithecine ancestors lived in forest and jungle canopies, as opposed to out on the savannahs.)"   - Dr. Ka Chun Yu, Fulldome mailing list, Oct 2006

Alien art on the dome - Aug 2006
(wait for download, move mouse over to start)