Something kind of cool I had somehow not fully noticed: You can split space into multiple intertwined and infinitely repeating regions (each fully connected to itself and not connected to the others). e.g. mathcurve.com/surfaces.gb/schw…

So you could, e.g., have a sippy cup with 2 spouts, one for coffee and one for water, such that the liquids were distributed approximately the same as if each was just a less-dense liquid completely filling the cup.