Bourges Cathedral is noted for its immense and unified interior space; there is no interruption in the interior between the west front and the chevet on the east. The pillars of the arcade are 21 meters high, more than half of the 37 meters of height up to the vaults. Each pillar is composed of a central column, two of which are attached to the slender colonettes which spread out at the top and connect to the rib vaults. The first two pillars of the first crossing at the west are of particularly large size. each with twenty-one colonettes. The successive pillars to the west alternate between the thicker "strong" pillars with five colonettes and "weak" pillars" with four, depending upon their position supporting the vaults overhead.