The church plan is that of a Latin cross with five aisles. The central nave vaults reach while the side nave vaults reach . The transept has three aisles. The columns are on a 7.5metre (25 ft) grid. However, the columns of the apse, resting on del Villar's foundation, do not adhere to the grid, requiring a section of columns of the ambulatory to transition to the grid thus creating a horseshoe pattern to the layout of those columns. The crossing rests on the four central columns of porphyry supporting a great hyperboloid surrounded by two rings of twelve hyperboloids (currently under construction). The central vault reaches . The apse is capped by a hyperboloid vault reaching . Gaudí intended that a visitor standing at the main entrance be able to see the vaults of the nave, crossing, and apse; thus the graduated increase in vault loft.