The windowsill is where things are set down to be seen or to grow in the light. It is read as watching and waiting, and what sits on it as something you are keeping in view.
Does the traditional reading fit your dream, or did it mean something else to you?
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.