Freud's investigation of that which lies beyond the pleasure principle is, among other things, an attempt to understand how thoughts on matter, biology, psychology and mythology become linked, despite the fact that each of these systems are independent and self-sufficient, each one working according to its own logic. Free energy, that we may liken to a kind of noise, is bound and organized in a process where subjective meaning is created. During this process, a meaningful connection between inner and outer reality is established. However, subjectivity also creates problems, since the individual needs to find his or her own self-realization, his or her own path towards the grave. Self-realization contains an aggressive potential, which – reminiscent of the workings of the immune system – may be aimed at everything that is not-self; at the unfamiliar or that which causes discomfort; at that which blocks the path towards the individual's mastery of the world.