Already in New York they are talking about how the new building stirs memories of the glory days of the old, much-lamented Penn Station, demolished in the 1960s, which was even grander than the now-restored Grand Central. Of it, it was said, "you entered the city like a God". The World Trade Center interchange may only be a nexus of commuter lines for now, but the plans are to extend the new airport rail link in here. So in a few years' time, this place could well be your point of arrival in Manhattan. You will emerge into the daylight at platform level 60 feet below ground, make your way up through the gradually unfolding layers, arrive in the main 360 foot long concourse, look up and find yourself at the foot of the Freedom Tower, with all of New York before you. In which case, this very ambitious building will take on a new functional and symbolic importance.

In this extraordinary place, Calatrava's metaphorical response is not overblown. He has had the good sense not to be too strident in this intense context. As a result, he has struck exactly the right note of optimism and rebirth, in what ought to be the best building of his career so far. Who knows if they will build it the way he's drawn it, but let us fervently hope so.

www.calatrava.com - see the great expressionist at work