As an aside, we use impossibly bright, impossibly blue light to inscribe tiny runes on sand, producing constructs that obey our commands (well, sometimes...) and communicate with us through literal liquid crystals.
This is not a fantasy setting. I'm just describing the real world
(well I'm leaving out 1000s of in-between steps, but still)
FUN FACT: the "nano" prefix ultimately descends from Ancient Greek "nanos", which means "dwarf".
Consequently, translating "nanotechnology" as "dwarven machinery" is arguably defensible.
@Unixbigot While explosions (as in shrapnel flying everywhere) are indeed unlikely, cylindrical cells will do the "rocket", if you somehow manage to get them into thermal runaway.
They will yeet some or all of their innards (the "jelly roll") in one direction (usually out the "top", i.e. where the positive nipple is, but sometimes also out the bottom) and all the rest will fly off in the other direction.
And all of that will be burning hot enough to melt aluminium.
Oh, and you really don't want to breathe the fumes.
Always think about what you're doing and have an exit strategy for when things go sideways.