[johncolanduoni]

Excepting some of the weird combining mark tricks used for flags and some more straightforward modifiers for skin tone, they’re basically a bunch of inert codepoints that you can get away with just popping in a high-res PNG for. No complicated typesetting, not even any kerning. If you handle surrogate pairs correctly (which is also needed for some real, widely used languages) common emojis will work fine.

I don’t see what’s technically impressive about them, care to elaborate?