Julian Cope presents Head Heritage

You could say the same about Silbury, that it's an irrelevant spoil heap, in fact someone did suggest it, or you could reverse the speculation and say the ditch was irrelevant, and merely the place the material was obtained from. I would have thought though, if we are to look at it in purely ergonomic terms, they wouldn't have built the wall as a spoil heap as the effort of piling it up would be much greater than spreading it out horizontally further away.