No light can enter and the person will be blind.
Light enters through a small window in each of the four sides.
When morning comes, the enemies sleep on, because no light can enter the house.
Its the first time in the history when the light of the Guru had entered a small child.
So the light and heat entering the building through glass has to be prevented.
The light by which he had been seeing since he'd entered the building was coming out from behind the partly closed door.
The first pale light of dawn was entering the room.
Consider that light can still enter from the sides of sunglasses.
The light can enter the walls but cannot leave again.
The light from the street lamp did not enter on this side, and the room was pitch dark.