You spin me right round!
Check out this page on sourdough on Wikipedia. Pay attention to the second photo, with the two loaves. The loaf on the right, with the neat circular flour marks, how do you get that?!?!?!?
For the life of me, I can't figure that out. Are you putting the loaf on a lazy-susan and tracing out the marks with a toothpick? Or isit well-trained flour weevils that have been taught to make those? Some sort of Johhny-come-lately alien making crop circles AFTER the grain has been harvested, processed and baked?