 Romanesque doorways have a character form, with the jambs having a series of receding planes, into each of which is set a circular shaft, all surmounted by a continuous abacus.The semi-circular arch which rises from the abacus has the same series planes and circular mouldings as the jambs.There are typically four planes containing three shafts, but there may be as many as twelve shafts, symbolic of the apostles.