I have to keep reminding myself that this is not waste, not mindless destruction - but art, performing and this stuff is just props.  Master WhistlinDiesel is a very clever chap. When I was a kid back in idaho my brother and I found a boulder, about the size of those tires, perched precariously on the side of the mountain.  We knew there were no homes below so we started digging and prying. After hours of hard work, the boulder started to move. It rolled down the hill, bouncing as it went, taking out huge trees and dislodging other boulders. We were thousands of feet over the river below and it took quite a while to get to the bottom.