Restrictions will be there for ifferent reasons, did your phase mother tell you to concentrate on the phase rather than the spiritual? Did the person in this dream put restrictions on how far up the tower you could go?
If it is a prison house, it has many depths and dimensions.
Take the idea of reincarnation for example, and the idea of the soul progressing through different species of plant and animal.
Now from that point of view it would look very convincing that the individual species/prison cells were created to teach the souls via punishment . for instance the soul stuck in a certain type of tree will be stuck there for hundreds of years and be very confined in their movements. Whereas us in the human bodies have much more freedom with set shorter sentences.