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We used aluminum window screen. I purchased them from this location was the cheapest at the time http://thescreenplace.net/category/36-brite-cote…. our rolls were 5' wide. We cut them to length and simply crumpled it all up to give it the appearance of rock.

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MRT Building in Berlin - the "skin" is made up of operable aluminum mesh panels so workers can manipulate natural lighting and airflow.

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