The room had no ports or skylights, nothing to show the exterior world.

It's the exterior world that interests her husband.

No break in the no-ship maze to the exterior world ever remained open long.

They had no passage to the exterior world of Macho.

But as I say, they need not have outlets to the exterior world.

"Do not lose yourself in the exterior world to the extent that you neglect the place of your eternal rest."

To do this right, it was nearly necessary to shut off the exterior world entirely.

In fact, we wanted the only opening on the exterior world to be this picture.

No human could tap the exterior world for its needed energy.

A sentient brain needs input; it is not designed to be cut off from the exterior world.