This is True
  Valentine's Greetings from Mars - Comments

Posted by Gilah, Karmi'el, ISRAEL on February 22, 2011:

Maybe it's just the way I'm viewing these photos, but the top one appears to be a pit to me and the bottom one appears to be more of a mesa.

Posted by Korey, Tucson on February 27, 2011:

I'm reading the images the same as Gilah. I tried different combinations of staring and looking away in an attempt to get them to reverse, with no success.

Read the article that everyone's commenting on, or post a comment about it.