dath ilan is a fictional world and civilization invented by Eliezer Yudkowsky. It is a parallel reality of earth where society is much better at coordination and various good policies have been implemented, though technology is only as advanced as earth's, if not slightly less. It can be thought as a more practical and realistic form of Economist's Paradise. Eliezer first introduced it in his April Fool's day post 'My April Fools Day Confession', where he claimed that he
actually came from that world and none of his ideas were original. Known features of dath ilan:
- Standard education includes rationality training (from which, allegedly, all of Eliezer's own ideas are plagiarized).
- Land Value Tax, positional-goods tax, status-goods tax, marketing-tax, no income tax.
- Movable Homes.
- Autonomous electric cars in tunnels instead of ICE cars on roads.
- No streetlights at night, except for red lights along walkways, which for 45 minutes each night also turn off to see the sky. And on winter solstice (night of stars) the lights stay off the whole night, to give a perfect view of the night sky.
- All humans (and other hominids, like chimpanzees) are cryopreserved upon death.
- If you commit a murder but don't want to consign your victim to true death, you can call in a government service, the Surreptitious Head Removers, who will remove your victim's head while being sworn not to report on
this and will do their best not to leave any traces of their own.
- Dath ilani holidays are known to include the annual Alien Invasion Rehearsal Festival and the annual Oops It's Time To Overthrow the Government Festival.
- In the fictional setting (though this concept didn't appear in the original April Fools post) dath ilan has found it necessary to try to causally screen off its entire history from its present - all old
textbooks hidden away, all old cities mothballed. As the Doylistic result, dath ilani characters ending up in settings with much lower social technology levels, such as Valdemar, Golarion, or Earth, start with little prior concept of how a less-coordinated society looks, and must learn from experience.