“When men say, for instance (by a false metaphor), that each member of the public should feel himself an owner of public property – such as a Town Park – and should therefore respect it as his own, they are saying something which all our experience proves to be completely false. No man feels of public property that it is his own; no man will treat it with the care or the affection of a thing which is his own; still less can a man express himself through the use of a thing which is not his own, but shared in common with a mass of other men.”