Michelangelos relief of the Battle of the Centaurs, created while he was still a youth associated with the Medici Academy, is an unusually complex relief in that it shows a great number of figures involved in a vigorous struggle. Such a complex disarray of figures was rare in Florentine art, where it would usually only be found in images showing either the Massacre of the Innocents or the Torments of Hell. The relief treatment, in which some of the figures are boldly projecting, may indicate Michelangelos familiarity with Roman sarcophagus reliefs from the collection of Lorenzo Medici, and similar marble panels created by Nicola and Giovanni Pisano, and with the figurative compositions on Ghibertis Baptistry Doors.