Focus on this artwork and discuss the Presentation.
A manifestation of "Untitled" (Portrait of Ross in L.A.) consists of a pile of candies individually wrapped in variously colored wrappers. Viewers are permitted to choose to take a piece of candy from the work and the caption describes that there is an “endless supply” of candies.
The specific type of candy used to manifest the work, the initial choice of configuration and overall size and shape of a particular manifestation of the work are decided by the exhibitor. The candy works have been exhibited as rectangular carpets of candies, heaped in the corners of exhibition spaces, spread across the floor in organic arrangements and shaped into mounds on the ground, etc.  
While the ideal weight of the work is a constant, the actual weight of the candies used to manifest the work is always in flux. The amount of candy changes as exhibitors make decisions about the weight that is initially installed, viewers choose to take candies from the work, and whether the candy is allowed to diminish and/or is replenished over the course of an exhibition. In one specific installation, art handlers at the Art Institute of Chicago recalled that the decisions for maintaining candies varied depending on visitors "During very busy periods, [we] may replenish the pile twice weekly, with approximately 45 pounds (20 kg) being added to the sculpture. On average, we add 15 or 20 pounds (6.8 or 9.1 kg) weekly." Sometimes the handlers would add candies to rebalance the piece's color.
Art Institute of Chicago