Designers, artists and friends, Stefanie Posavec and Giorgia Lupi are fans of non-traditional data gathering. The two (who live on opposite sides of the world) started collecting their own weekly statistics and illustrating postcards with the information—sending them to each other. The practice was both pragmatic and personal. Eventually, that year-long project—called Dear Data—became a book that blends art, facts, and friendship. (The entire collection of postcards was …