Look at the lack of strap needed on the tarp in the picture a few posts above. There isn't a gap between either end of the tarp and the trees. Did the designer size his tarp to fit those trees? How long do you have to look for a pair of trees that are the perfect distance to fit your tarp for a photo? When was the last time that your tarp diagonal fit exactly between two trees?
Not trying to be silly, it is just an amazing fit. That is a SUL length of tarp rigging.