Incan/Mayan Dudes Playing Grabass

This thing has probably been up in my house for more than 5 years. I never once noticed it until I started looking around for $#@! to put on this thread. Literally, it was the first thing I saw. I had to turn my head less than 90 degrees from the computer screen before finding this gem.
I'm so unwashed that I don't know what the proper term for this is... is it called a relief? Whatever, it's like a sculpture on a canvas. I believe the kids today call it: 3D.
Interpretation: I have no $#@!ing clue what is going on here, but the guy in back reminds me of Squiggy from Laverne and Shirley when he would make those weird gyrations whenever he and Lenny would see a hot chick. I can't tell if he is cupping his own balls, or going to get a piece of the big cat in front of him. This is probably some reproduction of a famous Mayan or Incan artifact, but for the life of me, I just can't get the phrase "power bottom" out of my head when I see this.