Drawing became an independent art form in northern Italy, at first quite within the framework of ordinary studio activity. But with nature studies, copies of antiques, and drafts in the various sketchbooks (those of Giovannino de’Grassi, Antonio Pisanello, and Jacopo Bellini, for example), the tradition of the Bauhütten studio workshop changed to individual work: the place of “exempla,” models, reproduced in formalized fashion was now being taken by subjectively probing and partially creative drawings.