Inge Johnsson via fineartamerica.com. This spiral staircase is a great example of radial balance! The fact that is goes on and on in a circular motion shows that it comes from one point of origin, which is located in the very center. It's very mind boggling, especially if you don't know if this photo was taken from up above or down below!
Sunnyside Sandbank @Sarah Richards thought you might like this for your project x
Stairs to the top of the dome, St Paul's Cathedral, London