"Jupiter and Mercury at the House of Philemon and Baucis" (1608) by Adam Elsheimer (1578-1610). Only 7x9 inches and a glowing oil on copper that has been in the Dresden gallery since at least the 1750s (and until June 2003 can be seen at the Royal Academy, London). The use of chiaroscuro was considered exemplary and copies and engravings abound. Rembrandt drew inspiration from it when painting his picture of the same scene, now in the National Gallery, Washington DC. As well as the goose, shortly to be reprieved by the Gods, Jupiter is seen looking at a coloured picture attached to the back wall of the cottage. Goethe, looking at an engraving, decided it must be one of "Jupiter's pranks performed with Mercury's aid" adding a hint of humour to the scene.