Ever wonder what an astronaut does on the International Space Station everyday? If you follow astronaut Scott Kelly on twitter, it appears he is dreaming of wetting a fly on the Big Horn river in Wyoming or Montana.

This pic showed up on Scott's twitter feed over the weekend and for some reason it looks like it is floating! The explanation comes back to an optical illusion called relief inversion and has something to do with the landscape being lit from below.

Rotate the pic 180 degrees and you have a more normal look at the river and if you look real close there is a fisherman in the third bend, right?