A Thing On A Roof

Drawing of some industrial thing on the roof of a building by the Gowanus Canal. It's a vestigal structure; the building is now a fancy furniture store. I have no idea what the building used to be or what purpose this thing served. I've since seen similar concoctions on buildings in other industrial and formerly-industrial areas, like Bushwick and Long Island City. I've really gotten into sketching industrial buildings and structures, even though I really have no idea what I'm drawing. Maybe because of that, imagining what function these complex structures and machines serve or once served.