How can we really know? The major rules in Calvinball are:
You never play the same way twice. Rules ares added or changes spontaneously. Not all parties must agree to a rule or a rule change.
Kinda sounds like how some states implement FED.
Other kids' games are all such a bore! They've gotta have rules and they gotta keep score! Calvinball is better by far! It's never the same! It's always bizarre! You don't need a team or a referee! You know that it's great, 'cause it's named after me!
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