A word for “inner protected world”

Question

What can be the word for "inner protected world"?

I want to use for this title sentence:

A guy in his inner protected world

It's some sort of mental sanctum.

I want to use it in a positive sense. In my local language we call it cossetto, the same as when a worm converts itself into butterfly. In my local language we say that it comes out from its cossetto.

Like I want to use it for a guy who is happy in his own environment , who doesn't worry about the world situated outside .

Please can someone suggest a better word or phrase?

Answer 1

From your comment to Penelov I think the word you are looking for is cocoon.

Cocoon noun 2. any of various similar protective coverings in nature, as the silky case in which certain spiders enclose their eggs.

You can use it metaphorically in your sentence:

A guy in his cocoon

It would imply that he has wrapped himself up and keeps himself away from the world.

Another possible word is chrysalis, which has a similar meaning.

Answer 2

You mean an introvert ? http://dictionary.reference.com/browse/introvert

Or self-enjoyment or perhaps the guy is a monk.