The bulletin board and thumb tacks are a standard system of connectors to be found in any office. The addition of batteries, wire mesh, and LEDs transform this system from physical to electrical.
The the left and right side of the bulletin board are covered with wire mesh which is connected to the power and ground of the battery. LEDs are connected to push pins with wire. A bit of copper foil is placed at the base of the tack to ensure a connection with the wire mesh.
