Sketchplanations
Confused parents wonder why their children aren't asleep after following all the right steps

In theory, practice is the same as theory, but not in practice

Anyone who's tried their hand at research, built some software, or even run a kid's birthday party may relate to this idea: In theory, practice is the same as theory, but not in practice.

It's a lovely encapsulation of similar ideas to "All models are wrong, but some are useful" or "No plan survives contact with the enemy." Or one of my favourites, Hofstadter's Law: "It always takes longer than you expect, even when you account for Hofstadter's Law."

Also see: Physics envy

The quote, in varying forms, has been attributed to a number of people — QI suggests that Benjamin Brewster should get the credit from 1882.

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