 The simple version of the theory is that the laws are the winners of a ‘competition’ among all collections of truths. Some truths are simple, e.g. the truth that this table is brown. Some truths are strong; they tell us a lot about the world. For example, the conjunction of every truth in this Encyclopedia rules out a large chunk of modal space. Typically, these are exclusive categories; simple truths are not strong, and strong truths are not simple. But there are some exceptions. The truth that any two objects are attracted to one another, with a force proportional to the product of their masses and inversely proportional to the distance between them, is relatively simple, but also quite strong in that it tells us a lot about the forces between many distinct objects. The laws, says Lewis, are these simple but strong truths.