Santiago Calatrava's original plans called for a soaring yet delicate spike design. Those plans were modified to make the terminal more secure. The number of "ribs" increased and the wing-like forms lost some of their delicacy.
New York Times architecture critic Herbert Muschamp wrote that the main transit hall "may now evoke a slender stegosaurus more than it does a bird." (
The New York Times, January 23, 2004)
Calatrava's vision is likely to undergo many changes. See: Transit Hub Design May Be Simplified, New York Times