Julian Cope presents Head Heritage

(a boringly unamusing guess) - maybe to do with the printmaking process of turning the sketch into something that could be printed in a book. I.e. it's likely the person doing the etchings wasn't the person who'd done the sketch, and so hadn't been there, and didn't know the scale. But that it would be appropriate in the style of landscape paintings of the time to pop in a few rustic locals? Making it less scientific and dry, and more Romantic and about experiencing the monument as made by our druidic ancestors?

I don't know really.