Amanda Shendruk writes about the work that’s done after Burning Man, where 150 people line up, side by side and arms apart, and slow walk the entire playa looking for Moop (Matter Out of Place).

This forensic-style sweep takes weeks; everything they find is removed and logged. At the end, they’re left with a remarkable accounting of what 70,000 people left behind: The MOOP Map. And I’m obsessed.

The Moop Map is a pretty remarkable view of what is left behind:

Swiss mapmakers have been quietly seeding their work with little doodles—marmots, spiders, even the occasional hidden hiker—inside official maps.

It also implies that the mapmaker has openly violated his commitment to accuracy, risking professional repercussions on account of an alpine rodent. No cartographer has been fired over these drawings, but then again, most were only discovered once their author had already left. (Many mapmakers timed the publication of their drawing to coincide with their retirement.) Over half of the known illustrations have been removed. The latest, the marmot drawing, was discovered by Swisstopo in 2016 and is likely to be eliminated from the next official map of Switzerland by next year. As the spokesperson for Swisstopo told me, “Creativity has no place on these maps.”