My goal is to provide a clear explanation of Leibniz’s notoriously difficult system of relations. Relations among ‘windowless’ substances that exert no causal power over one another seems like a pipe dream that should be abandoned. However, I demonstrate that each substance expresses its relations only through the unique representation of all other substances. That is, any relation a substance expresses is due to this unique, perspectival, non-causal, representation of others. Because this is the case for all substances, this means that this relation of representation is an ongoing process of interconnection for all substances. This representation is not merely a cognitive copy of the universe (i.e. all other substances); it is the expressi...