An introduction to the theory and practice of Chaos Magic, by Peter J. Carroll, co-founder of the Illuminates of Thanateros.
In contrast to the workbook orientation of the Liber Null, the Liber Kaos provides a theoretical background and context to the metabelief system of Chaos Magic.

The book first attempts to explain magic in terms of quantum physics and chaos theory, without delving into belief systems. The second part of the book then goes to great lengths to define the types of magic, possible magical outcomes, and the proper uses of belief to achieve magical ends.