It is a cheeky one, and you really should have a look at the souvenir shop...
In the tea room where we stopped for a lovely tea, they were selling a great clock. It was a tad overpriced, which is a shame because it was very tempting to just buy one for the sake of it!
There should be movement here, to show you how it's really working ;-)
Some say that the chalk giant comes from ancient times - there are several versions of that one as well - and, for obvious reasons, that it is a fertility symbol. It was long believed that childless women could bear children after lying on his crotch. Ha. Some people need the facts of life explained to them, don't they? ;-)
The other version is that the giant is a caricature of Oliver Cromwell.
More on the giant here: CERNE GIANT