Once in the Lobby, which serves as a distributor, the visitor enters the Atrium, the true heart of the Museum and one of the distinctive features of Frank Gehry's architectural design. It is a large open space with curved volumes that connect the interior and exterior of the building through large glass curtain walls and a large overhead skylight. The three levels of the Museum are organized around this central Atrium and are connected by curvilinear walkways, titanium and glass elevators, and stair towers. The Atrium, which also functions as an exhibition space, serves as an axis that organizes the 20 galleries that the Museum houses, some with a more classic appearance and orthogonal lines and others with more organic and irregular volumes. The play of volumes and perspectives allows for interior spaces in which, however, the visitor does not feel overwhelmed at all.