Check this out, though, Phil . . . Click on your link and look at that big white rock under magnification on the right hand side (about 1/4 of the way down from the top of the picture) . . . Immediately to the right of that rock, it looks like Richard Simmons is peeking out of a hidey hole at the Spirit rover! I can just see the top of his head and his eyes. LOL . . . I'm seeing things again.
Bad data? . . . same spot in two different pics?? . . . and, I think I see a shadow . . .
crystaline?