Any projections on the vertical planes symbolize a woman's breast.
Accordingly, your interest in the projections say about your craving for a good female figure.
If you hold on to the ledge, stand or hang on it, apart from the sex in this life is very little that interests.
For a woman, does that mean the pursuit of lesbian contacts.
To dream that you are standing on a ledge, indicates that you are feeling tense, anxious and/or excited. Consider what direction you are looking? Up? Down? Straight Ahead? The direction to which you are looking relates to your viewpoint, whether it be an optimistic one, pessimistic one or realistic one. On a more positive note, this dream may signify a sense of freedom and liberation.
To dream that someone is standing on a ledge, denotes a sign of desperation and a cry for help.