Question: I was in the Black Rock Desert, a huge salt flat in NV, and over head, maybe twenty feet, some guys were shooting a massive green laser out across the desert. Looking out at it, it looked like the laser beam was curved and curved precisely as what appeared to be the curvature of the Earth. The best explanation I could come up with is that the Earth is flat. What do you think? Is it simply an optical illusion. Is the Earth being round an illusion?