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In the wise words of Strong Bad...

"The word 'technology' means 'magic'! It's basically anything that's really cool that you don't know how it works."

We know how it works, it changes the brightness based on screen contents.

That's what it does, not how it works.

I.e., 'What' is just the top-level abstraction. 'How' is the functional composition underneath.

No the guy released the source code so you do know how it works as well