"In Praise of Ambiguity" presents a discourse about the seriousness of play. Erasmus and Huizinga are its main characters, their books In Praise of Folly (1511) and Homo Ludens (1938) its main subject. It treats those books as contemporaries and asks what they still have to say to us. The main theme of both books is the contrast between two attitudes of life: the conviction that each subject has two or more sides as opposed to the certainty that there is always only one side to the matter. It...