  Leibniz's basic idea here should conform closely with our intuitions. Imagine God's considering a set of individuals {a, b, c, d}. From God's point of view he could choose to actualize this world with one set, L*, of laws of nature or with another set of laws, L**. And this choice represents a choice between two possible worlds. This is similar to our saying that we would have a different world if the gravitational constant were different. Now, this way of speaking is not exactly right, for on Leibniz's view, the different sets of laws would ultimately produce different properties and perceptions with the individual substances. As a result, the individuals in the worlds governed by L* and L** would strictly speaking be different.