From the introduction: Everyone chooses a Dangerous Idea to play. Dangerous ideas should be broad enough to encompass several specific truths (or truisms), which will enter the game as ‘memes’. For example, one player might play ‘Manifest Destiny’, with memes of ‘one area should have one ruler’ and ‘white men are superior’. Another player might play ‘Man is the Measure of All Things’, with memes of ‘a tree that falls in a forest makes no sound’ and ‘science should be funded in accordance with its usefulness’. If the group wishes, everyone can play the same kind of thing—different religions, the perspectives of different animals, or different management philosophies.