The interior entrance lobby is floored with pink-granite, and included a straight four metres (13 ft) wide ramp which slopes upward towards the west.[33] Safdie noted the importance of the ramp in his design, stating that one should "go through some kind of procession to make your way into something s important as the National Gallery," and that it gave the visitor the feeling of making an ascent to a ritual, a ceremony.[34] The walls of the entrance lobby is lined with rectangular cut pink granite, excluding the southern wall, which part of the glass-walled exterior facade.[35] A glass and steel ceiling reminiscent of Gothic cathedral architecture, extends the entire way of the ramp.[35] However, as opposed to most Gothic cathedrals, the ceiling has a number of concrete columns spaced out to support the roof.[35] The summit of the ramp leads towards the Great Hall of the building, situated in the three-storey glass cupola.[30]