Three metals, Aluminium (Al), Iron (Fe) and Copper (Cu)
sandwiched between glass, held in cotton wool in a conductive solution.
Over time, the metals transform due to electrical activity generated by the disimilar metals.

The process represents a form of electrochemical emergence, whilst the filament growths from the iron share a similarity to the experiments conducted by the Cybernetician, Gordon Pask in creating an electrochemical device that could recognise sounds, known as Pask's Ear.