Now completed, at a cost of $143 million, the structure is an amazing tour de force. The glass units are neither roof nor façade: they are simply bulging, overlapping segments supported by an intricate mesh of steel.
Frenchmen sell berets. But Frenchmen don't buy them. Tourists do. In order to indicate they've been in France. One possible theory is that Frenchmen sell berets in order to spot foreigners more easily.