Did anything catch your eye today, or perhaps it escaped your notice? Small inscriptions on walls, stickers on the reverse side of street signs, chewing gum machines daubed in pink paint. We register it as fly droppings, advertising rubbish or the onset of colour blindness. But actually, it's art. Street art takes the streets and public spaces and uses them as a gallery. It comes in all the shapes, colours and sizes that materials and creativity permit.
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