Fabian Winkler has created an interactive installation piece called Dielectric. Inspired by the buzzing of powerlines, Winkler has created a structure that is a hybrid of powerlines and a traditional hammock. A sensor measures the changes of the electromagnet field. When a person approaches, she or he disrupts the electromagnetic field causing arcing, which is when electricity jumps across space to make a connection (it's kinda similar to lightning). A person can also lay in the hammock. By doing so, she or he becomes part of the electromagnetic field. As the person is laying in the hammock, another person can come up touch the visitor which disrupts the electromagnetic field and thereby triggers arcing once again.

via we make money not art