The tower has duality in the spiritual sense, since it can be feminine in the shelter it affords and masculine because of its shape.
It suggests ascent to the spiritual realms, but also descent to the practical.
The inner aspects of the tower represent our inner life, whereas the outer signify the structure we present to the world.
Also consult the entries for escape, rescue, shapes and trap / trapped as well as the information on tower in buildings for further clarification.
