Here's a click through of a much larger version of the image.
I do wonder if the artists who created this were inspired by the helicoid geochronograph in James Gurney's Dinotopia books. In those books, the inhabitants believed that time was neither linear nor circular, but a combination of the two: a spiral. As such, they built a large spiral clock, as well as smaller hand held timepieces, called helicoid geochrongraphs. Artistic coincidence?
Take a look at the pages in question from Dinotopia: a Land Apart from Time below and make the judgment yourself.
|Page 68, Dinotopia: ALAFT|
|Page 69, Dinotopia: ALAFT|