Why did the Ramona Parra Brigade make temporary murals after the 1973 coup in Chile?

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Following the 1973 military coup in Chile, the Ramona Parra Brigade created temporary murals on untreated public walls using commercial paints. They chose this approach because, for these artists, the act of creation was more significant than the durability of the finished product. By utilizing impermanent materials, they ensured their work could be quickly executed and served as a vital means of communication with the non-gallery-going public during a period of intense political repression.1