Each light that turns on and eventually turns off represents a new metal that is activated and decays, through electricity.
BasBased on a system, each vessel has a positive and negatively charged wire in the water. As electricity runs through these wires, the metal begins to deteriorate and galvanize. A light is hooked up to each set of wires. Once the wire cannot conduct electricity through its entire length, the light fades out, no longer illuminating the vessel where the decay occurs. This represents the end of the system. Different wires, electricity amounts, and amount of salt in each vessel is used, giving a unique lifetime to each vessel.