Art Installation Concept

Today while at the VAG I had a discussion about forms of art. One idea I came up with was to have a room held at 0 degrees Celsius and place some blocks of ice in it. In the middle would be a sledgehammer with which a viewer could destroy the ice. Now the catch would be that a portion of those viewing the exhibit would partake in destruction and a portion would choose not to, the catch being that regardless of whether or not you were to actively destroy the ice, your presence would heat the room causing the ice to melt. Perhaps it could be taken even further in that for each visitor that swings the sledgehammer the temperature would be lowered a degree and for each one that does not it would be raised a degree. Hmmm....