It is often difficult to let go.
For the sender, deja helps them understand how much time and effort it takes to do so, through the act of stitching.
For the recipient, the difficulty in moving on is represented by the resistance in unravelling deja — an irreversible process once the stitches are undone.
Embodying the element of time, deja is an expression of sympathy and a nudge to keep moving forward.