In Brighton, teenagers have been spray-painting large murals to highlight the issue and to stimulate conversation.

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The approach will be of particular interest in industrial applications, as it is compatible with existing spray-painting technology.

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Dressed in traditional Orthodox-jewish clothing accessorized with fake beards, they quickly gained access to the store's safe, spray-painting two security cameras in the process.

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The southeast Asian city-state of five million people is perhaps best known for banning the sale of chewing gum or caning vandals, including American Michael Fay in 1994 for spray-painting cars.

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Engineers can calculate the most efficient route for a spray-painting robot to take around a car body, work out how quickly parts must be supplied, look for bottlenecks or even tell if a human worker's task is likely to give him backache.

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Rubbish and graffiti often go hand-in-hand but spray painting pavements could stop people littering - at least that is the theory a Cardiff student is putting to the test.

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Many of the surrounding walls, which are brightly decorated with graffiti art, are the product of locally-organised painting sessions known as the Wall Project, which get people together with spray cans and paintbrushes to beautify their surroundings.

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To date, his highest profile work has been a collaboration with handbag designer Anya Hindmarch, and spray painting the entire alphabet on the shop shutters of a street in Spitalfields in his signature ice-cream palette.

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