lol... center of mass? center of maxima? center of minima? ... and what's a "side"?Wouldn't they use the center of the stone instead of a corner or a side? If they used a corner or a side wouldn't they specify the directional side or corner? Seems to me the center would be the best designated point.
200 years ago, two farmers agreed that stone made the corner of their two 100+ acre properties, and they weren't even thinking about the possibility that someday someone might care about what part of said stone they had figured.