A cellmate stands for someone who shares the same constraint as you, and tradition reads the bond between you as either comfort or friction in a tight space.
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.