What is Philosophy?
Deleuze, G & Guattari, F, 1994, What is philosophy?, Columbia University Press, New York.
The three planes, along with their elements, are irreducible (p. 216):
Philosophy: plane of immanence, form of concept, concepts and conceptual personae
Art: plane of composition, force of sensation, sensations and aesthetic figures
Science: plane of reference or coordination, function of knowledge, figures and partial observers.