When Healing 1 encounters a foreign body, such as a gallery visitor, the pattern on it pulls away, creating a wound. When the foreign body leaves, the pattern heals itself and the wound closes but the sides of the wound never actually touch. A scar remains—a memory of the interaction between the visitor and the mat. Over time the scar may be eradicated, but it has a permanent effect on the pattern's growth. At any moment the pattern is the result of both the underlying algorithms and all the interactions that have occurred up until that moment.
