Refrigerator magnet pictures an antique painting from the 1770s of a alchemist trying to develop an philosopher's stone.
The painting was produced by Joseph Wright (1734-97). Wright's work is often cited for its representation of the emerging industrial revolution during the Enlightenment.
The philosophers stone, according to fairy tales, turns metal into gold and can produce elixirs. Alchemists in World of Warcraft are masters of the philosophers stone.