"2+1=3 it also equals 21." ChNN

[deepbluehum]

IIRC, He was talking to a child. The is really about different ways of using language, different rules of the language game. It's about not fixating only on one's own rules. Obviously we know two plus one equals three and if you put two and one together you get twenty one. So there is a game being played with the meaning of plus. If you go to another country often one will encounter things like this in real life. Like in countries that use decimals instead of commas to denote number scales.