Just to throw in some exercises for your brain? Check this photo out from David Neises' and mine biking trip yesterday and let's hypothesize?
You can right click on the photo to zoom in for better view of my biking glasses or also ctrl-mouse wheel or search for 'How to zoom in' for better explanation in your web browser or do CTRL+ to zoom into the page and then find the photo at large size.
P.S. The photo was taken by David at "Iggy Falls" on the biking trail off 123rd and Nall in Leawood where last year I had a rather humorous and easy fall on the grass as I offroaded to take the short cut. Somehow David found this name humorous and fitting.
P.P.S. This spot is right by the Leawood "MILF Park" - this is a story by itself, that I will leave up to David to explain.