Another obsession, foreign money. Except you cannot call it money, you have to say "currency" and if you mess up his sorted piles he'll look at you like the world is ending. Unbelievable how much enjoyment he's getting out of this. Comparing coins to each other, converting them to US money to see how much they are worth, pondering what the countries cultures are like. This is so much better than video games!
Some awesome vegans are offering to send him coins & bills from other countries and he is downright thrilled. Yet another reason why