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spray onto surface (The short video shows a crack that grows larger until a big piece of the wall breaks off and tumbles down, followed by a rush of soil until “large chunks of essentially plain concrete come falling off the wall,” he said. Adebar said the wall was made of shotcrete, which is a form of concrete that is sprayed onto surfaces from a nozzle, as opposed to being poured into forms.  vancouversun.com ART Vancouver) | |||