Urville is a city of 14 million inhabitants that exists entirely in the mind of Gilles Trehin, a French autistic savant.

Trehin began creating plans at the age of 12, using Lego blocks and model airplanes. Today, at 33, he has drawn extensive maps and landscapes of his creation, as well as inventing a culture and a detailed history going back to the 12th century B.C., when he imagines the city was founded by the Phoenicians.

Today, in Trehin’s mind, Urville is the third largest city in the developed world, behind Tokyo and New York, and boasts 87 cinemas, 42 cabarets, 174 public swimming pools and European offices of I.B.M., Sony, Citybank, Olivetti, and Siemens.

“Imagination is more important than knowledge,” wrote Albert Einstein. “Knowledge is limited. Imagination encircles the world.”

The French Romantic poet Gérard de Nerval had a pet lobster, which he would walk through Paris on a blue ribbon.

He said he regarded lobsters as “peaceful, serious creatures who know the secrets of the sea and don’t bark.”

American building designers often skip the number 13 when numbering their floors, because 13 is considered an unlucky number.

The Chinese are similarly superstitious — they omit the fourth floor, because the word “four” sounds like “death” in Mandarin.

If you think you’re a packrat — cheer up.

In 1929, brothers Homer and Langley Collyer holed up in a Harlem townhouse and basically set the all-time record for reclusive hoarding. They kept to the house during the day, and at night Langley fetched their water from a park four blocks away, dragging home abandoned junk.

In 1942, when they missed a mortgage payment, the police investigated but couldn’t get past a solid wall of junk behind the front door. In 1947, when rumors surfaced that Homer had died, a team of seven men finally began excavating the foyer, which was choked with old newspapers, folding beds and chairs, half a sewing machine, boxes and parts of a wine press. A patrolman broke into the second floor and spent two hours crawling through packages and newspaper bundles before he discovered Homer, dead in a bathrobe, his head on his knees. The recluse had been dead only 10 hours, so the smell was coming from somewhere else.

Authorities began unpacking the house. Among other things, they found baby carriages, rusted bicycles, a collection of guns, gas chandeliers, the folding top of a horsedrawn carriage, three dressmaking dummies, a kerosene stove, thousands of books about medicine and engineering, human organs pickled in jars, a clavichord, two organs, the chassis of an old Model T, a horse’s jawbone, an early X-ray machine, and more than six tons of newspapers, magazines, and wood. After several weeks of searching, they found Langley 10 feet from his brother. He had been crushed in one of his own booby traps.

In total, police and workmen took 136 tons of garbage out of the house, including 14 pianos and more than 25,000 books. It was eventually torn down as a fire hazard.

The Cadillac Ranch is a public art installation in Amarillo, Texas: Ten junker Cadillacs are buried nose-first in the ground, at an angle corresponding to that of the Great Pyramid of Giza.

What will future archaeologists make of this?

A note found stuffed in a vase in a Massachusetts thrift store.

More at Found Magazine.