It is known that we live in curved space. But what if there was a world just like ours, but where space was far more curved, and what if everything in that world was bilaterally symmetrical to ours? It is more than just easy to imagine such a world: to observe an excellent representation of it requires merely looking into this mirror.
[image] mcost "Microblogging Session" Sept. 4, 2008 Flickr (Accessed Jan. 11, 2009)
[ * ] This photograph strongly reminds me of the sorts of things that enchanted M. C. Escher -- particularly his well known "Hand with reflecting sphere". Here is an homage to that Escher litho, but done with modern color photography.
[ * ] The planet Mercury, recently in the news due to some nice satellite photos, brought the issue of curved space from mathematics into physics. That planet was just a bit uncooperative in how it moved around the sun, given what Newton's physics predicted.