Mail art: Trebuchet

Some mail art with a sketch of a trebuchet in action. I couldn't quite get a source photo of a trebuchet in action from this angle, so I winged it a bit... I think I might have drawn it backwards, but I guess you have to imagine the big heavy weight swinging the full spectrum all the way to the back, then it might (possibly) be plausible... The sender bit is meant to be a rock's eye view from the bucket of the trebuchet. Not quite sure that I pulled this off.