These fan vaults, built around 1500 in the retrochoir of Peterborough Cathedral look very organic, like palms or toadstools growing up and spreading out until they meet. It's hard to imagine the how the medieval masons turned ordinary stone into something so beautiful.
Tony
For more info: http://photoreflect.blogspot.com/2008/05/fan-vault.html
Tony
For more info: http://photoreflect.blogspot.com/2008/05/fan-vault.html