Set in its windows, like pearls in an oyster, are an elegant Attic red figure krater attributed to a 5th-century BC painter, an Etruscan pouring vessel and an array of vases.
But, I love the idea that this child, this precocious, sophisticated child, stood and saw this painting, through the window of the shop and thought, " That's how I want to live." So, follow me and I'll take you upstairs.
Casper also devised another code: a triangular advertising sign on the shop window meant that it was safe to come in, if it was placed back to front, it meant that it was better to wait.
But first I have a question for you, Beth. Another example of nudging happened in Woolwich, an area of London which in 2011 had a problem with anti-social behaviour, and particularly with shop windows being smashed.