In the Getting Started with Lenormand post I provided a list of simple associations which included:
Tower, 6 of Spades, Institutions, Organisations, Ego, Solitude, Life span, Higher learning, Physical places.
Tower in relation to a Signifier or Querant can be a sign of Ego, Solitude or Life span. Ego due to its dizzying height. Solitude much like many fantasy princesses locked away. Or Life span, as it can be an indication of withstanding the tests of time. Brick by brick it was built, an endeavour of itself.
In some cases, the Tower might represent a Physical place, one that you seek to travel to or attend.
Tower also represents Institutions, Organisations and Higher learning. In this way, it can represent Universities, Laboratories, large businesses and historical landmarks. It could also represent academically or magically inclined groups.
As always remember that Context is Key, and allow the space to consider what is being expressed broadly as well as narrowly.
Keep an eye out for tomorrows post, Garden.
Love and Manyfold Blessings.