with a little effort, I could make an entire argument that most 'disk' images were drawn from halos and hats and crowns and bowls and rocks and other 'naturally round and/or domed items'...even from the sun and moon...But that would be a much less interesting hypothesis, huh?

We see what we want to see....

I can wonder at those paintings, but statements in the page like this:
"Some people believe they may represent ET beings." really bemuse me. Of course "some people" believe that...some people really believe that fairies are real also. Perhaps they are...I can't 'prove' them wrong.

A WWW search in Google for mandala images will show how pervasive circles (of MANY sorts) are in the history of art.

(By the way...I am a science fiction fan who would LOVE to see a real alien or UFO....and I have no doubt that somewhere in the universe there MUST be life besides our own planet. It would please me a lot to have answers before I die...but I won't hold my breath, as I don't look good in blue...;>)"