Nederland, 1938: Johan Huizinga published his famous work "Homo Ludens: a Study of the Play Element in Culture". Since the 18th century our species is called "Homo Sapiens", but we are not so reasonable, said Huizinga. "Homo Faber" (Man the Maker) is maybe better name for human beings, but "Homo Ludens" (Man the Player) is the most appropriate one, if we want to emphasize the central role of play in human culture. I like very much Huizinga's sentence: "The play-concept as such is of a higher order than seriousness. For seriousness seeks to exclude play, whereas play can very well include seriousness." There is no need to say how seriously I am playing with my 20th Century games.