According to an article from the Daily Mail (first published in July 2012), concept sketches for J.K. Rowling’s tree house have appeared in the city of Edingburgh’s planning records. One cool feature is that the “towers are linked by a rope bridge and can be approached by a secret tunnel hidden underneath a raised wooden walkway.” Click here to view the first image in today’s viral picture gallery. Continue reading for a video on the simple yet awesome physics behind a hovering plane.