 Kilvington employs all types of measurement to describe different cases both real and imaginable. Having adopted Ockham’s ontological minimalism, he claims that absolutes, i.e., substances and qualities, are the only subjects that undergo changes. Therefore, such notions as ‘motion,’ ‘time,’ ‘latitude,’, and ‘degree’ do not have any representation in reality and only serve as tools for the faultless description of the processes of various changes. Thus, Kilvington contrasts things that are really distinct with things distinguishable only in reason, i.e., in the imagination. Imaginary cases are descriptions of hypothetical situations; to be imaginable means to be possible, i.e., not such as to generate a contradiction. Everything imaginable must be logically possible within a natural framework. So we can imagine the void and formulate the rules of motion in it, because there is no contradiction either on the part of nature or on the part of God for the void to exist. Any theory, whether it describes an imaginary case or an observed phenomenon, must be coherent. Therefore, logic and mathematics are the best methods to describe any reality: factual or imaginable.