'Face' in Lindisfarne Castle wall

Whilst I was looking up at the castle wall, framing out a photo (on holiday in August 2013), one of my sons spotted this 'face' in the wall. There's a hat, eyes, nose and mouth and, to me, it looks just like Pinocchio, the puppet.

Camera/lens settings: ISO 100, f/13, 1/20s, 55mm, hand held.