In 1975 the artists Brian Eno and Peter Schmidt published a set of cards designed to provoke creative thinking. The Oblique Strategies deck has become a legend of the art and design worlds.

Both Eno and Schmidt had a collection of sayings to break creative blocks: prompts, questions, suggestions, or cryptic quizzical notes. Schmidt called them “thoughts behind the thoughts” and Eno called them “oblique strategies” and in 1975 they combined them and put out a limited edition of 500 signed decks.
These original decks are collector’s items, of course. Today there’s one original deck selling on eBay for five thousand Euros. But the Oblique Strategies have gone through at least six editions and many online tribute versions (I’ve linked to one below). Next time you have writer’s block or any other creative barrier, try thinking deeply with one of the following:
Honour thy error as a hidden intention.
Don’t be afraid of things because they’re easy to do.
Faced with a choice, do both.
A line has two sides.
Get your neck massaged.
Repetition is a form of change.
Water.
The subtitle to the original edition says it all, really: “Over one hundred worthwhile dilemmas.”
https://play.google.com/store/apps/details?id=uk.co.manateelabs.obliquestrategies