This public art interactive by Maria Stukoff blurs the lines between art and technology on the streets of Clayton Square in Liverpool, UK. The large screen displays a field which, upon the detection of a Bluetooth-enabled device in the immediate area, reveals a new flower which grows as the device gets closer. This was interesting to me in how it translated the invisible nature of the networked space into a physical interpretation.
http://www.brenocallaghan.co.uk/wp-content/uploads/2009/03/screenzine_11.pdf (pg3)