974614 Heimdallr blowing the Gjallar horn to summon the gods of Valhalla to combat (chromolitho) by European School, (19th century); Private Collection; (add.info.: Heimdallr blowing the Gjallarhorn to summon the gods of Valhalla to combat at Ragnarok. Educational card, late 19th or early 20th century, from a series on Norse mythology.); 穢 Look and Learn.