The bright arc is actually a very hot, electrically-conducting channel of air.
Hot air rises, so the arc moves upward until the distance between the electrodes becomes too great.
Today we live in an electrified world and take our electricity supply for granted. The exhibition identifies some of the ways people used the new technology to transform their lives, and particularly how women used electrical appliances to change the nature of their work at home. The exhibition is structured both chronologically and thematically in six sections, set in Ontario from 1880 to 1960. How Ontario got electricity is a human story. We can't see electricity but we can see electric current arcing in a Jacob's Ladder.