At the heart of the dispute is the relationship between the height above the edge of the cliff at which the rocks are balanced (y) and the distance, horizontally from the base of the cliff, to whi...At the heart of the dispute is the relationship between the height above the edge of the cliff at which the rocks are balanced (y) and the distance, horizontally from the base of the cliff, to which the rocks will range (R) should they roll down the hill and fly off the cliff.