Photo taken on May 6, 2020 shows a general view of Brazilian artist Alex Flemming's artworks covered with "face masks" by the artist on the platform of Sumare subway station amid COVID-19 outbreak in Sao Paulo, Brazil. (Xinhua/Rahel Patrasso)

Brazilian artist Alex Flemming puts on a "face mask" over one of his artworks on the platform of Sumare subway station amid COVID-19 outbreak in Sao Paulo, Brazil on May 6, 2020. (Xinhua/Rahel Patrasso)

Brazilian artist Alex Flemming puts on a "face mask" over one of his artworks on the platform of Sumare subway station amid COVID-19 outbreak in Sao Paulo, Brazil on May 6, 2020. (Xinhua/Rahel Patrasso)