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Inspired by the Chess move of the same name, Castling is a form of equivalent exchange. Castling is when someone gives something of value/does a favor for someone else, with the soul purpose being that that person will then owe them something of value/some sort of favor at anytime in the future.
"I just gave you a Coke, that's called castling. Law of equivalent exchange. Now you have to name your first born after me."
Derived from the chess move, 'Castling' refers to the law of equivalent exchange. When you are 'Castling' you are doing a favor and/or giving something of value to/for another person, with the sole intention that they will then owe you a favor/item sometime in the future.
"I just gave you a Coke, that's called Castling. Law of equivalent exchange, now you owe me a favor in the future. I want you to name your first born after me."