If I want to see where a place is in the world, I just need to look at where the lines cross, and read the numbers. Ah, there he is! Latitude is 32 degrees south, and longitude is 115 degrees east.

Geraldo Cid of the New York City–based collective Art Code Data has designed a mind-boggling mashup of interconnected transit lines from 214 cities on five continents—a tangle of 791 metro ...