Sometimes graffiti can be so powerful, or beautiful, amusing, or thought-provoking. I will often take a snap if I see some that makes me smile or think. Here is a selection, some from Cambridge, Krakow, London, Ljubljana, Tbilisi but mainly from Norwich, and most of those by my favourite steet artist, the mysterious :J – you can see here, the ‘Renaissance Man’, the brilliant ‘Austerity’ and ‘Britain wins gold’