Michael Dean
Hardness can be deceiving. Despite its reputation for intransigence, concrete is a uniquely subtle, delicate material. The surface of any motorway flyover, housing block or city pavement reveals a spectrum of patinas through which it absorbs and reflects its surroundings. Metal fixings soak rusty stains into their concrete bases; shoes and rubber tyres apply patient layers of dirt and oil onto walkways and roads, and rainwater causes streaks of discolouration (or sometimes just colouration) to develop across walls.
Jonathan Griffin 