Oblique Strategies (subtitled Over One Hundred Worthwhile Dilemmas) is a card-based method for promoting creativity jointly created by Brian Eno and Peter Schmidt, first published in 1975. Physically, it takes the form of a deck 7-by-9-centimetre (2.8 in × 3.5 in) printed cards in a black box. Each card offers a challenging constraint intended to help artists (particularly musicians) break creative blocks by encouraging lateral thinking.
In 1970, Peter Schmidt created "The Thoughts Behind the Thoughts", a box containing 55 sentences letterpress printed onto disused prints that accumulated in his studio, which is still in the possession of Eno. Eno, who had known Schmidt since the late 1960s, had been pursuing a similar project himself (which he had handwritten onto a number of bamboo cards and given the name "Oblique Strategies" in 1974). There was a significant overlap between the two projects, and so, in late 1974, Schmidt and Eno combined them into a single pack of cards and offered them for general sale. The set went through three limited edition printings before Schmidt suddenly died in early 1980, after which the card decks became rather rare and expensive.
