Shortest yet deepest books you know

What are the shortest books out there that also happen to be the deepest and most jam packed? I'm trying to gain knowledge but not waste too much time. ya feel?

I have no mouth and I must scream.

>gain knowledge

So you're looking for non-fiction?

Read it already. Well, technically, audiobooked it

Vonnegut's books are short enough to be read in a day and I personally like them, though he's admittedly very accessible and not as deep as people like to think he is.
Plays tend to be very short. Willy's stuff has far more depth than most writers could dream of cramming into a novel.

Well, either really... Non-fiction primarily. Fiction if it is worth my time.

Well, either really. Non-fiction primarily, but fiction if it is worth my time.

>For sale: Baby shoes. Never worn.
Damn...

Honestly, the graphic adventure is the complete experience.
It may be the only book where the video game version is the ultimate version.

I do like Vonnegut short stories quite a bit. I have worked through a handful of them. 2BR02B is a good one and that one about the machine with the sound from space or whatever... which ones do you recommend the most?