Six degrees of curiosity
I adapted this from Sonya Huber's "Six Degrees" experiment. (She calls activities "experiments" which I like, in her great Backwards Research Guide for Writers; Augusto Boal calls them "games," emphasizing the element of play.)
The John Guare play "Six Degrees of Separation" popularized the idea that each person on the planet is connected to every other person by no more than five other people. Guare used the idea to examine the ties that bind each person to each other person and the play between our unity and our separation.