Late Medieval and Renaissance art was surprisingly pushy; its architecture demanded that people move through it in prescribed patterns, its sculptures played elaborate games alternating between concealment and revelation, while its paintings charged viewers with imaginatively moving through them. Viewers wanted to interact with artwork in emotional and/or performative ways. This inventive and personal interface between viewers and artists sometimes conflicted with the Church's prescribed devotional models, and in some cases it complemented them. Artists and patrons responded to the desire for...