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Wow, that must be really useful down there! I'm sure your countrymen are jealous!
Well, technically, we all see everything upside-down, just that our brains correct this minor problem.
Great tale nonetheless!
I too have shot with the camera upside-down. Sometimes, when doing touristy self-portraits, or when I needed that extra inch or two to see over heads in front of me. Works great if the camera has a grip with shutter release on the bottom and you don't mind shooting left-handed.
As for the original question - I am left handed and started off shooting right eyed because that's how SLRs are optimized, therefore for camera control I also became right-handed, though I still can't write right-handed. I've been in photography getting on 30 years now (started very young) and I think I slowly wore out my right eye, because it's now no longer as sharp (astigmatism) as my left eye. Therefore, if it's a matter of critical focus, be it SLR or rangefinder, I switch to left eyed. Incidentally, when I shoot right eye I keep my left eye open for better peripheral vision. Comes from shooting a lot of sports where it's always good to see if danger is coming from the side. This freaks out some subjects, usually at wedding receptions after they've had a few drinks. Same thing when I shoot without even looking through the camera... that really boggles their minds.