Foundations are what a building rests on, so dream books read them as your basic values and early experiences. Laying one stands for a new beginning; a cracked one for unease about your footing.
Where in your waking life have you met something like this lately?
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.