By Vurdlak on October 12, 2006, with 86 Comments
What do you think this photo from Mars below represents? Is it a Convex Object or Concave Crater? Many of my friends argued on this one, before I gave them true answer. NASA said it shows “Victoria crater,” an impact crater at Meridiani Planum – near the equator of Mars. The crater is approximately 800 meters (half a mile) in diameter. Peter Hosey sent in this fabulous illusion. He said that it “Looks like a convex object, but that’s actually a crater — the Victoria Crater at Meridian Planum on Mars, photographed by the Mars Reconnaissance Orbiter.”
(27 votes)
Just a crater. Shadows are inside. None outside.
i stared at it then looked away to read the text above it and it looks as if it’s moving further away
This works better with a smoother circle crater like you see with moon craters. Where this one has ridges, the shadow totally tells you it’s a crater.
You can make it a crater by covering the bottom right corner of it and you can make it a “island” by covering the top left corner :)