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Use old political signs to line the walls or make a frame to slide in panels of this material. After elections the outdoor signs that are all over the landscape are supposed to be removed within 24 hours. The politicos and the county usually have no objections to removing them as they are usually taken down and disposed of. Obviously, this is not great for demo purposes where visibility is important, but in your private workspace it is a great inexpensive alternative to buying more expensive plexiglass.