the significance of any stone or group of stones is subject to the possibility of radical change. A stone or group of stones that is important at one point can become dispensable as a result of later developments. Stones can even be used as sacrificial offerings for the sake of later gain and may or may not be accepted as such. The significance of the vulnerability of the stones accustoms the players to the reality of impermanence, and again this is found to be not a dreadful situation,