Guardian: In the event that it is ever actually built, the Freedom Ship, “the world’s first mobile, floating city”, will have to be constructed at sea: there isn’t a port on the planet that would be big enough to accommodate it. “Imagine a mile-long stretch of 25-storey buildings in New York City; now imagine that floating on the water,” one reporter wrote, after detailed plans were released a few years ago. As it turned out, “imagine” proved a well-chosen verb. But there was no denying the …