Simple Hypothesis Testing

Over 8 feet tall in some places, which is a better hypothesis about this pile: that this was dumped from a cart or that it was carefully built by someone?Update: I could see someone coming up with an excuse/explanation of the flat wall. But not the extra corners.
Update 2: covering perhaps 100 square yards (10x10) I cannot see that it would even be possible to dump rocks from a cart at the center of this pile. So, if anyone wants to defend the "field clearing" hypothesis, send 'em over here to address this example.