I would use the WebTracker item type in MediaLab. Make 12 simple html pages each with a variant of the circle. Each has a bigger & smaller link that takes you to the next or previous circle. You could do it as a custom item too or with java but this would be a quick way to get it done.
[edited from follow-up response]
You’re a clever one, Blair Jarvis. Clever indeed. That’s actually even better as I can see how much they vary the circle before reaching their final decision!!!
Thanks a million!![]()