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is it, though?

https://github.com/SLaks/Silon#implementation-details

"Silon is implemented using LESS to generate CSS selectors for every combination of inputs that will turn each gate on. In effect, I created a LESS-based DSL that expresses (almost-)arbitrary boolean expressions."

Yes, I know a preprocessor is involved, much like many single-element/background-image hacks and CSS-only glitch effects which translate to fifty-keyframe animations.

It's still cooler than the OP.

it's definitely shinier than the OP, but I personally think encoding a sieve of Eratosthenes in a CSS selector is cooler than encoding truth tables in a CSS selector

I was always more interested in the philosophy of mathematics than prime numbers.

Actually, I'm interested in philosophy in general, especially early Wittgenstein & Gödel.

So I'm biased.

Yes, it is. Almost-arbitrary boolean expressions vs. completely straightforward and obvious use of a CSS selector.

That's not just cool, that's crazy!

wait, what?!