A world drained of colour is read as emotional flatness, fatigue or a time when nothing quite stirs you. Dream books also see it as a blank state before something new takes shape.
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.