They look like trellises and fishtanks, spacesuits and mailboxes, the New York Times reports. One squeezes into the cracks of a historic building. Others offer built-in seating. New York, meet your newest public libraries. Holding no more than about 20 books for old and young, the 10 new Little Free Libraries — miniature lending libraries where anyone can take or leave a book under the honor system — will pop up all over downtown Manhattan on Saturday afternoon, and will stand until Sept. 1…