A tower rises above its surroundings, so it is read as ambition, perspective and isolation. Being shut in a tower points to feeling cut off; climbing one to reaching for a higher view.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.