Messaggi sul cemento
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Si trovano in tutto il mondo: sui muri, sotto i ponti o perfino sui vagoni. In bianco e nero o a colori. I loro autori agiscono per lo più nell'illegalità, protetti dalla notte o dalla nebbia. Per alcuni i graffiti sono una forma d'arte e un nuovo mezzo di comunicazione. Per altri si tratta semplicemente di un atto vandalico.
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