The purpose is to bring outside light, fresh air, or both into the inner space.

Most importantly, you can finally round out your education and learn something about inner space.

If he has not so much explored inner space, it is because stars were at his feet.

"It's all about inner space, finding a place that you call your own."

You can treat a picture as a window onto something (open sky, inner space).

Then the adventures of inner space can seem more compelling.

Ah, but how about a little voyage to inner space?

Perhaps it will take them into time or the inner spaces of their own hearts.

Time ran at a different rate in inner space.

Her own race had the knowledge to do it long ago but they decided to instead concentrate on what might be called inner space.