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As the school admin or custodian (whoever okays this type of thing) to
screw in a long piece of wood across the entire wall at a comfortable
viewing height. Then use this piece of wood to pin, staple, or etc. to
attach artwork. ((They also make a metal rimmed strip with corkboard in
it, but this might be too dangerous in a gym or cafeteria, if someone
were to knock their head into it.)) I would go with the treated wooden