As New York’s expensive condo high-rises go up, more of the parks and streets below are covered by a permanent shadow. WaPo’s Emily Badger on the sky-scraping metaphors rising above Central Park. “They’re a stark reminder that the new growth needed in healthy cities can come at the expense of people already living there. And in some ways, shadows even turn light into another medium of inequality — a resource that can be bought by the wealthy, eclipsed from the poor.”