Awe-inspring. But one thing I don't get: he says he wants every building to be included, but the buildings in NYC are anything but permanent. Did he pick a particular timestamp for everything, or is it a mosaic of different epochs? Keeping the model up to date would be even more insane.
I might have to visit this exhibit next time I'm in NY. I hope their materials will answer the question of how he dealt with new construction, remodels, and demolitions over his 20 years!