The subway that runs under the road connecting the Potterrow student union to the back of the Old College and the National Museum of Scotland has often caught my eye because of its shape and the perspective it creates. Walking past it at night, though, it made me think of something from an old sci-fi movie – the concrete underpass where the Droogs beat up a man in Clockwork Orange, perhaps.

Or, on a lighter note than that, it reminds my geek brain of the fighter launch tubes from the 1970s Buck Rogers, or Battlestar Galactica (albeit a much more monochromatic one!).