is this yours?

No idea who is responsible, but there's a road in Brighton, Upper North Street, that houses some of the city's most unusual, and temporary grafitti. The other day I walked along there with some friends and spotted – it was early evening, with the sun beginning to dip behind the houses – that someone had etched the outline of a postbox's shadow onto the pavement; one shadow for the shade it cast when caught in the sun, another for when the streetlights were turned on. The next day it had gone.

A couple of days later, I walked the same route, and spotted this.