Rings on Cardiff Bay Barrage

After the event nearby, we walked round some of the bay. The children spotted this on the barrage which seemed to line up when the barrier was closed.

Fab day!

More details of the circles can be found :

http://www.moillusions.com/2007/04/cardiff-bay-baragge-illusion-by-felice.html
http://news.bbc.co.uk/1/hi/in_pictures/6530989.stm