Psychologically: A very frequent dream symbol for a feeling of the isolation and for 'unattainableness in spite of nearness'. One can see somebody (or a little bit), but give a hand neither, nor hear. If one may be removed just few steps of each other, with all transparency the glass wall prevents the real contact: At best one can give each other still 'sign'. Who has lovesickness or sees after an involuntary separation him (now for own feelings inaccessible) beloved people over and over again, often dreams of the distinguishing disc - all the same whether this is now a window, a glass wall or a door. What can also mean: Look once again exactly whether it really makes sense to want to 'smash the separating. (See also glass, wall)