Made of This, a book by Gianni Simone and Randy Osborne, charts their exchange of 999 linked memories, each memory from Gianni inspiring one from Randy, over a two-and-a-half year period.
Strangers who "met" by email as a result of separate artistic projects, Gianni and Randy learned much about each other and themselves as their traded memories deepened.
They also found a deceptively simple method that any pair of people (or more) can use to do the same, a few quick, easy lines at a time.
For more about the history and metholdogy of Made of This, here's the associated blog.