Something Else to See on the Stump

This strange marking is on the old stump in front of the house.  Now I know that the white is some form of lichen, but it was the way it was outlining the crack in the wood and filling in selected parts that made it so interesting to me.  It reminded me of some of the petroglyphs I've seen, left behind by an ancient people.  Do you see a serpent or fish of some kind?  This old stump never disappoints.  Gift#275: an entertaining stump.