In the clouds float homes. They sit atop ships as big as cities or, in rare cases, states and sometimes as small as little dingy. Like most human-made ornaments that decorate each part of the world, they all started out as solutions for a variety of different problems. And, as time as gone on, most have either become obsolete or created new problems to deal with. Many of the medium sized (about the size of a mega yacht) ships were made for luxury. You can live anywhere with the best views. An...