During the cool spring and summer days, the operable skylight of the Oculus opens to bring part of the New York sky to the building, evocative of the Pantheon in Rome.
With the Oculus operable skylight - visitors can look up in a columnless space
Still suggestive of adornments from many traditions, the form can be summed up, according to Calatrava, by the image of a bird released from the hands of a child.