[joelanders]

Stumbled across and started reading A. E. van Vogt's "The World of Null-A" last night.

Super trippy.

https://en.wikipedia.org/wiki/The_World_of_Null-A

http://www.amazon.com/World-Null--E-Van-Vogt/dp/0765300974/

[jfoucher]

Null-A is probably the Van Vogt's most famous book, but others are great as well, I loved "Slan" from the same author : https://en.wikipedia.org/wiki/Slan

[tech-no-logical]

didn't expect anyone to mention this book... but it's been a long time favorite of mine. I first read it in my teens, when I was heavily into asimov, vance, dick and other classics :)