No face. It was an artefact of low-resolution image and the propensity of human brain to see faces everywhere (paraeidolia).wiki said:High resolution Mars Reconnaissance Orbiter image of the "Face on Mars". Taken using the onboard HiRISE camera.
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As for mathematical relations, if you look hard enough (and squint a little), there are funny mathematical relationship between everything.
If NASA had been able to offer more angles, different times of day, etc, it would have been more evidentiary. Not faulting them for not having the time, resources, etc, to do it on that mission, but multiple angles/lighting conditions, etc, would have gone farther to make their case. If they have the opportunity to do that in future missions, then I will be convinced they're right.
This guy presenting this is a little wordy. The stuff about the "face" begins at about 3:30, and the 3-D flyover is right at the end. Link:
http://www.youtube.com/watch?v=zSTb16AGj7I