Angels

Whilst giving one of my sisters a massage I watched the end of an episode of Dr Who entitlted Blink. The actress who played Kitty Bennett in the 2005 Pride and Prejudice and Isabella Thorpe in the 2008 Northanger Abbey was the main character. The concept was that statues of Angels are beings who are only able to move if no living thing is looking at them. If you blink they move and they are very fast, so don't blink.