I love it when I encounter a very nerdy thing that is clearly very impressive for very nerdy reasons but the specifics of which are entirely beyond me. For instance, this Linus Akesson Commodore 64 demo entitled NINE is "seemingly impossible." By and large because the Commodore 64 can only support "8 sprites on a given raster line" but this video proports to use more!

Look, I don't know anything about C64 rendering limitations and the related rabbit holes are just as confusing but that doesn't make it any less interesting! Great animation, fantastic music and a little mystery if you care to unlock it.