A snow globe holds a perfect little world under glass, so it is read as nostalgia and a wish to keep a moment unchanged. Shaking it stands for stirring up a calm that was only on the surface.
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.