San Pietrini translated to "little St. Peters" is the playful expression Romans use to describe the cobbestones that pave the city of Rome. The play on words points to St. Peter's role as the rock of Christianity. Guerrilla style in the wee hours of one morning in December 2010 I took a chance and hightlighted the negative space between the San Peitrini with fluorescent pink paint goo. Alas, the grid IS in Rome!
