The essential idea of Schelling's Natur philosophieis that, in the same way as the I of self-consciousness is both active and try to reflect upon as an object, nature is both actively 'productive' and is made up of objective 'products'. Schelling attempts to address the identity of the processes of nature with the processes of thought in terms now more familiar from Freud. The System of Transcendental Idealism (STI), aims at a view of nature in which our free actions can be in accordance with what happens in both external and internal nature. Schelling used the model of the plant in order to suggest a unity of subject and object, freedom and necessity. The Idealist aspect of the STI's investment in the aesthetic becomes apparent when the development of history is seen in the same terms as the work of art.