G-sprite,
Are you suggesting that you would not infer that the "I Love You" in the sand was man-made? This seems to be the best answer to me, if not, then what would you infer? That natural processes of erosion created the words "I Love You" in the sand? I see your point, but the "face" on mars is more akin to finding animals in clouds. (Although there are lots of groups who believe it was created by aliens, so to say you "know" it was created by natural forces is begging the question a bit). Your thoughts?