Limestone is built from countless tiny shells laid down over ages, read as the slow accumulation of experience. Its softness to water stands for strength that can still be shaped over time.
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.