Berlin is the city of grafitti. People spray images and slogans and colour everywhere. But to my mind, there is something very particular about graffiti on doors - for three reasons. Firstly, doors attract more artists and they are prepared to overlay their work on others; secondly, the artist is in a hurry - these doors often open into blocks where many people live and they use the doors often - so there is not time for considered work; and, thirdly, to spray on a door - the entrance to a home - is a very particular intrusion. So multiplicity, quickness and the barrier of psychological intrusion make for abstract work. Here, by deliberately making the images square I intend to deny the 'doorness' and let random abstraction show.