Ever decreasing circles

Or the red eye from the one eyed purple idol brother of the green-eyed yellow one from the old dirge that starts:

There's a one-eyed yellow idol to the north of Khatmandu,
There's a little marble cross below the town;
There's a broken-hearted woman tends the grave of Mad Carew,
And the Yellow God forever gazes down....
here's the rest if you can take it

For those interested this blip was done by dropping the pop-up drinking top from a well known brand of children's milk drink (OK - Mars) into the bottom of a plain glass standing on a black piece of card.

I removed the shadows from around the glass in P'shop, sharpened it up a bit and twiddled (technical term) with the contrast and then added a keyline for fun.

But I do believe that some of those circles may be ellipses...clearly a badly blown glass...(But then, an expression including the words bad, blame, tools and workmen, springs to mind)