seven ages of man sculpture... or...

...stack of heads statue!
actually I could have done with a 'heads up' before I saw this, as it happened I spotted it and fumbled about for my phone camera, I was on a bus at the time - I am amazed it came out so straight, bit of a fluke there, and you can see some motion-blur!  fascinating for its strangeness!

more info here
http://www.waymarking.com/waymarks/WMGZEK_The_Seven_Ages_of_Man_Sculpture_London_England