Sand stands for time slipping through the fingers and for foundations that shift. Dream books also read its countless grains as small things that add up to something vast.
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.