If you know how to convert a bowl of stuff into a box of stuff, and a box into a bag, and an urn into a crate, and a crate into a sack, then there are two equivalent ways to convert a bowl of urns into a bag of sacks: we can either construct methods going from bowl to bag and from urn to sack and combine them to go from bowl of urns to a bag of sacks, OR, we can go from a bowl of urns to a box of crates to a bag of sacks.
http://blog.sigfpe.com/2008/05/interchange-law.html
So much sense. Such verisimilitude. Rarely does one see an extended metaphor which so closely correlates with reality.
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