London is constantly changing. The streets and skies of the City look different today from how they did last year, and the year before, and thirty years ago. The day I was born, in October 1994, was a pretty important day for my life, but it was just another Wednesday in the long history of London. The past is a place we can never visit, though by using Tipp-Ex on recent photographs, covering everything built after 1994, we can get a glimpse of what it might have looked like.