Happy Face on Mars Exposed

A feature on Mars appears to look like the common yellow smiley-face sticker. However, seen in a new "perspective view" by the European Space Agency's Mars Express orbiter, the so-called smile looks like your average 'line of mountains.' A recent study shows that people very easily see smiles in random objects like the moon or Mars because they are so accustomed to the human face. The perspective view shows that the smile is just another part of the Argyre Planitia impact basin, which is 143 miles wide.

http://www.space.com/scienceastronomy/060410_happy_face.html