Street photography is like an essay - with the camera you capture moments, which tell little stories. Like the photo which makes you wonder what's just outside the picture, it's curiosity which makes the street photographer roam the streets and find out what's round the corner.

I've lived in Frankfurt many years but every now and then I really like to go off and discover a new bit, or I see the city in a different light, and then it's always changing. The reason I've linked up a series of pictures of Frankfurt with pictures taken in London is a purely personal one. Over the years I've made many visits to London and, as at the same time it becomes more familiar to me, I find even more to explore.

Sometimes I got into conversation with people on the streets and I asked if I might photograph them. While I took pictures they told me stories - like the two young men having a break; five days working on the construction site and then home for the weekend to their families in distant Sauerland. The slide guitarist comes from Hackney in North London - an aspiring musician, he has small gigs in clubs and earns a bit extra playing in the street.

There's a pace out on the streets - the jostling crowds, the trafffic and noise, the quickly changing face of the city; something comes down, something goes up. Street photography, moreover, documents these changes and the still photo focuses on and freezes a moment of a certain time.

Morag Minner