"She said that cleaning crews had orders to remain 20 centimetres (eight inches) away from artworks but it was unclear if the woman had received the directive f

"She said that cleaning crews had orders to remain 20 centimetres (eight inches) away from artworks but it was unclear if the woman had received the directive from the external company that employed her." Even if she had received such a directive, I think she could be forgiven for mistaking that "tower of wooden slats under which a rubber trough was placed" as art.