sentences:  The ribs of this vault distributed the weight more equally to the four supporting pillars below and established a closer connection between the nave and the lower portions of the church walls, and between the arcades below and the windows above.This allowed for greater height and thinner walls and contributed to the strong impression of verticality given by the newer Cathedrals.The second major innovation of the Gothic style was the flying buttress, which was first used at Notre-Dame Cathedral.