Walls signify a block to progress, a difficulty we have or will come up against. Often the nature of the wall will give some clue as to what the block is.
For instance, a wall which looks old will signify an old problem, whereas a glass wall would indicate some difficulties with perception. Walls closing in could describe the remembered feelings of birth, but is more likely to represent a feeling of being trapped by the lifestyle we have.
A brick wall, rampart or dividing wall all signify the difference between two states of reality – often the inner psychological state and the exterior, everyday world. Windows – windows describe the means by which we appreciate the world we live in, the way we perceive reality. Dreaming that we are looking outwards through a window can suggest that we have a more extrovert view of ourselves and will tend to look at external circumstances. Looking inwards through a window indicates we are looking inwards at our own personality, and perhaps at our own motivation.
The interpretation for opening a window depends on whether we are opening the window from the inside or the outside.
If the former, we are dealing with our inner feelings which we may need to escape; the latter shows our attitude to outside opinion. Breaking through a window (or glass door) can suggest the first sexual experience, or the shattering of illusions. Because of the connection with religious buildings, stained glass can be accepted as picturing religious belief and ideals.