This stone is doing it's job well and is quiet the conversation piece, IMHO any stone that brings interest and attention to it's self is worthy of display regardless of any rules and for this reason I rather like the stone. Without the drawing I personally don't really see the horse and most likely wouldn't have w/o it being mentioned beforehand, but this most likely is due to only seeing the stone through a photograh. My first reaction to the stone was it reminded me straight away of a certain collected meteorite movie. I found a picture for clarification and hunted around a bit and found a relevant quote from the show.
Meteor Bert: Well, it aint a meteor.
Joe Dirt: Yeah it is. It came out of the sky.
Meteor Bert: Well I'm sure it did but it aint no meteor. It's a big ol frozen chunk uh s$%t.
Joe Dirt: What!
Meteor Bert: Oh yeah, see them airplanes they dump their toilets 36,000 feet. The stuff freezes and falls to earth. We call 'em bowing bombs
[chomps teeth]
Joe Dirt: no that cant be. Thats not what it is
Meteor Bert: oh, afraid so. See that peanut? Dead giveaway.
Joe Dirt: Uhhh, no, thats a space peanut.
Meteor Bert: No, afraid not. That just a big ol' frozen chunk of poopy.
Studio manager: Dude you were eating off it!