In the center on that image is a stone with a form of a wheel bearing.the first images above without arrows for better observation Leaning against a stone and half buried in the earth is a disk that is several inches thick and has three holes.
Much here is to find and to think. It's all fantasy, or a game of light and shadows?
I think not, here are more than 15 (fifteen) abnormalities in a
A click on the images open the same image in an 800x625 resolution for a better observation
A click on the images open the same images in an 1027x768 resolution for a better observation
Source: Spirit PIA11746
PIA11746: Full-Circle 'Bonestell' Panorama from Spirit
PIA11746.jpg (6,833 MB)