Someone decided to build a bunch of buildings and turn them into a metropolis. You don't know who they are, but now an absolute ton of other someones you don't know also live here in these buildings and work in this busy metropolis.
You try to picture the faces of all the people who live in this metropolis, but for some reason you can only picture their toes (と). And there are ten times as many toes in this city than someones.
Currently there are no similar looking kanji which exist in the WaniKani learning system