You have 20 people in a room. They all have a thing. They all want a thing. The problem is, no one wants the thing the person who wants their thing, has. Someone pulls out a token. Everyone in the room agrees that token is worth one thing. Slowly the token gets passed around. I give the token I get the thing I want. The person getting the token can now get the thing they want. Eventually the person who pulled out the token gets it back and gives their thing to the person who wants it. That’s ...