"And why Tom Tiddler's ground?" said the Traveller. "Because he scatters halfpence to Tramps and such-like," returned the Landlord, "and of course they pick 'em up. And this being done on his own land (which it IS his own land, you observe, and were his family's before him), why it is but regarding the halfpence as gold and silver, and turning the ownership of the property a bit round your finger, and there you have the name of the children's game complete.