In the nave of Sant’Apollinare in Classe stands what, by the time it was constructed, had come to be called an altar (Figures 13 and 14). By the sixteenth century, not only the name but also the matter, the form, and the composition had come to provoke thousands of Christians, some to call for their replacement with wooden tables, some to singular physical violence, bringing sledgehammers to smash into rubble what had, for generations, stood in choirs, apses, and chapels and against columns. Even those who left them in place no longer accorded them the same role in the Mass. For Lutherans, they were the surface for the celebration of the Eucharist. For Catholics, they were more, but no longer what they had been. Even the great Jesuit scholar Joseph Braun, whose study of altars remains foundational, defined the altar as “that liturgical instrument [Gerät] on and at which the Eucharist was celebrated.” It was for him a thing. He accorded some six pages in a 756-page volume to the “symbolism” of the altar. For him, meaning was given to the altar by texts: commentators, liturgists including Durand, canon lawyers, popes, and theologians. The altar itself was mute.