 Bernini sought a solution whereby the high altar above the tomb of the first Pope of the Catholic Church could be reconciled with tradition.With his design for the "Cathedra Petri" or Chair of Saint Peter (1657–66) at the apsidal end of the chancel, Bernini completed his visual "concetto" or design idea; the congregation had a perspectivised view down the nave to the image framed by the baldachin which compressed the distance between the crossing and the Chair of Saint Peter in the chancel, reconciling the Prince of the Apostles' tomb, his implied presence on the Chair and his legitimate successor officiating at the ceremonies.Four marble plinths form the basis of the columns that support the baldachin.