these sort of features look raised..

• by Dreamsight

  are they, or is it because of the shadows and a trick of the light?

  Posted January 10, 2013 8:02 PM

• by mschwamb scientist, translator

  It looks raised like mountains but it's actually channels carved into the dirt. Learn more here and here.
  Cheers,
  ~Meg

  Posted January 10, 2013 8:08 PM

• by Dreamsight

  like the Hollow-Face illusion

  Posted January 10, 2013 8:18 PM