It can go the other way, too, where some object left by a visitor becomes part of the exhibit: http://www.independent.co.uk/arts-entertainment/art/news/pineappl

It can go the other way, too, where some object left by a visitor becomes part of the exhibit: http://www.independent.co.uk/arts-entertainment/art/news/pineapple-art-exhibition-scotland-robert-gordon-university-ruairi-gray-lloyd-jack-a7723516.html http://www.independent.co.uk/arts-entertainment/art/news/pin...