 Their twisted barley-sugar shape had a special significance as they were modelled on those of the Temple of Jerusalem and donated by the Emperor Constantine.Based on these columns, Bernini created four huge columns of bronze, twisted and decorated with laurel leaves and bees, which were the emblem of Pope Urban.The baldacchino is surmounted not with an architectural pediment, like most baldacchini, but with curved Baroque brackets supporting a draped canopy, like the brocade canopies carried in processions above precious iconic images.