IMPT: first example of groin vaults with RIBS (supporting arches) along their groins
*Interior has a nave and two aisles, but no transept
*Each bay consists of a full square in the nave flanked by two smaller squares in each aisle, all covered with groin vaults
*Main vaults are slightly domical, rising higher than the transverse arches
*No clerestory—octagonal dome’s windows provide the major light source
*The lightest pier moldings stop at the gallery level
*The heavier pier moldings rise to support the main vaults