For change to be possible, we said above, self-reflection and entrepreneurship are not enough, neither alone nor when taken together. Once the world is reflected on from a number of alternative perspectives it will necessarily come to seem hopelessly diverse. The visions do not relate to each other in any straightforward fashion and many contradict each other as well as the established orthodoxies of the age. The universe cannot, for example, simultaneously have the sun and the earth at its centre. Likewise it is not possible for all entrepreneurs simultaneously to realise all of their projects. Once they start putting their ideas into practice, space, time, and other scarce resources will quickly start to run out.