 Since memory just is the imagination of signs, the development of instituted signs makes memory possible (natural and accidental signs are only ever sensed, not remembered). The institution of signs further allows us to set up names for groups of ideas that are too complicated to be distinctively yet collectively imagined, such as ideas of any number larger than six, of substances, of complex modes (notably moral and aesthetic qualities) and of genera and species of things (Essay I.iv). It is also supposed to give us control over our imagination and an ability to govern our attention (Essay I.ii.4. §46). This allows us to reflect on other aspects of our experience than those most immediately related to our needs. Reflection brings connections between objects to our attention that we would not otherwise notice and puts us in a position to refine our language by instituting names for what we have discovered. A more refined language facilitates yet more exact reflection, and language and our reflective capacities proceed to work in tandem to develop our cognitive abilities to their highest level (Essay I.ii.5).