Is it possible for someone to do an experiment at the salt flats in Utah? I have an idea, but with no means to implement it. Say you attach a very strong laser light, with a bubble level, to a pole about 10 inches off the ground, then have someone else 5 miles away mark another pole at 10 inches off the ground. If the light was powerful enough to reach it without spreading out. shouldn't it hit pretty close to the 10 inch mark if the earth is flat? Just thinking/typing out loud.