I constructed forty clay balls made from a plaster mold that I made from a large (16" in diameter) bouncy ball.
I then covered them in black wax.
I loaded them all up into the back of a pickup truck and took them to the site (near a friend's friends farm).
I walked each ball out into the field about a quarter of a mile distance, set it down and came back to get another ball to carry out like the first....so on and so on, until all forty are carried.
I set up a camera to document the performance.
The whole thing took four hours to do... and I estimate I walked maybe sixteen or seventeen miles or so...
(watch for the deer that run across the frame...in the background as I'm walking back on the first ball...pretty cool)