Was re-reading Think Like Reality and came upon the following quote from Eliezer - emphasis mine.
The same optimization process that built your retina backward and then routed the optic cable through your field of vision, also designed your visual system to process persistent objects bouncing around in 3 spatial dimensions because that's what it took to chase down tigers. But "tigers" are leaky surface generalizations - tigers came into existence gradually over evolutionary time, and they are not all absolutely similar to each other. When you go down to the fundamental level, the level on which the laws are stable, global, and exception-free, there aren't any tigers. In fact there aren't any persistent objects bouncing around in 3 spatial dimensions. Deal with it.
For those who don't get the reference: http://knowyourmeme.com/memes/deal-with-it
(Though if you didn't already know of that and/or don't care for silly internet meme humour, then reading the linked page will probably not cause you to find the above comment funny. Deal with it.)
Better late than never, a new open thread. Even with the discussion section, there are ideas or questions too short or inchoate to be worth a post.
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.