Reaching beyond the three familiar dimensions is read as the mind stretching past ordinary sense. Dream books link it to a new way of understanding time, or to insight that is hard to put into words.
When this appeared in your dream, what were you feeling?
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.