The most common themes on rock engravings are large wild animals, such as bison, deer, horses, aurochs, and human-like animal hunters.
In the latest image captured by Curiosity mars rover, despite the deliberate poor quality of the photo, we see a rock representing what looks like a symbol of an animal hunter engraved into the rock.
So, is this Mars rock with its engraved pattern of an ancient animal hunter a sign of the past or is it just an illusion?
It is interesting that similar symbols are found in different parts of the planet Earth created in timelines where the people could not have possibly interacted with each other.
SOL 993 - Link Image: http://mars.jpl.nasa.gov/msl-raw-images/msss/00993/mcam/0993MR0043950290503211C00_DXXX.jpg