How do you know when you've seen a gerrymandered district? Maybe it looks like a duck or a snake, or a pair of earmuffs. Or maybe there's no obvious sign that the mapmakers played games with the contours in order to ensure a particular electoral outcome inside those boundaries.
The last contests using the current set of congressional maps are a year away. After that, the results of the 2020 census will be used for the redistricting of the entire country — assuring a fresh burst of gerrymandering by politicians with the power to draw maps designed for keeping themselves in power. (The North Carolina districts mentioned below are very likely to get altered before the next election, however, to settle a lawsuit alleging the current map favors Republicans so much as to violate the state Constitution's "fair elections" clause.)
We asked half a dozen people who have studied the way American political maps are drawn to reveal their best examples of the most flagrant current gerrymandering. Of course there are plenty of ways to approach that task. In some cases, the really odd shapes make it easier. In others, experts need to dive deep into demographic data to discover the most egregious examples of packing and cracking.