Adam Aaronson (a software engineer who also plays jazz trombone and electric bass) has a blog post with all sorts of Hattic material; it starts with an observation made by Alex Boisvert on Crosscord, the crossword Discord server:
JET BLACK and JETBLUE have very different meanings, even though they look superficially similar. Same thing with CATNAP and DOGNAP. Any other examples of this?
Adam continues:
Suffice to say, the Crosscord hivemind had other examples of this. Will Nediger replied a few minutes later with the clever MULTITOOL and MULTIPLIERS (words with completely unrelated meanings, despite the fact that PLIERS are a TOOL). Several messages later, Alex chimed back in with the elegant PUB QUIZ and BAR EXAM, a pairing that had been used in some form in crosswords by constructors Christopher Adams (2018) and Robyn Weintraub (2021).
Something about this concept—two sets of synonyms (PUB and BAR, QUIZ and EXAM), which when paired together, form phrases that themselves are not synonyms (PUB QUIZ and BAR EXAM)—captured the minds of Crosscord. Suddenly, the floodgates were open.
People suggested UBEREATS / SUPERFOOD, THROW SHADE / PITCH BLACK, BOOTY CALL / BUTT DIAL, ROMAN MARS / CLASSICAL RUINS, PERMANENT PRESS / FOREVER STAMP, and others.
There’s something going on here. Something more than a shitpost or an ephemeral trend. Double doubles have the proverbial juice, and the juice lies in their structure. Each pair of pairs can be modeled as a square, where the corners are words and the sides are relations between those words […]
It’s this square structure that makes each double double feel tight, feel satisfying, feel like a real “find”. This is the essence of what I’ve started calling square theory, and it applies to much more than just posts in a Discord server.
Click through for much more, including crossword examples (e.g., Will Shortz’s all-time favorite clue, [It turns into a different story] for SPIRAL STAIRCASE). Via MeFi.
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