A Shape Is a Strategy
Gerrymandering works by manipulating the *shape* of voting districts rather than the votes themselves — concentrating your opponents' supporters into a small number of districts they win overwhelmingly (a strategy called 'packing'), while spreading them thin across many districts where they always lose by a small margin ('cracking'). No individual vote is touched. The map does all the work.
That's what made the original Essex County district so visually strange — its odd, snaking shape wasn't an accident of geography, it was the geometry of a specific vote-counting strategy, made visible enough that a cartoonist could draw a monster out of it.

