Found this little gem while cleaning up my hard drive today:
That's a fairly late-process snapshot of the different wallball target designs we considered. I like a few of them still for different reasons, although (obviously) I'm happy with the one we went with. These led directly to our prototypes:
Which of course became the final targets we all know and love. Incidentally, you can mosey on over to our store and order a set of these babies for yourself, right here. Just saying.