Found art

You just never know where art turns up. A few months ago art turned up in Neiman Marcus. Today it turned up on an Oakland sidewalk.

side A

side B

Surface design on a southern magnolia flower petal. I'm guessing. So surprised & delighted by the find, I didn't look up and around for the tree.

What made the markings? It doesn't look like tire tracks. My walking friend speculates someone purposely stamped it. Would you do that? 

Mysterious markings by a mystery artist.

I like a mystery. Let's stamp more petals.