Programming and Metaprogramming in the Human Biocomputer: Theory and Experiments is a 1968 book by John C. Lilly.

This would include the brain, internal organs, and other human organ systems such as cardiovascular, digestive, endocrine, immune, integumentary, lymphatic, muscular, nervous, reproductive, respiratory, skeletal, and urinary systems.

Certain energies and materials (heat, light, sound, food, and secretions) pass through this boundary in special places.

Levels two to three are the boundaries of body and brain, in which special structures such as blood vessels, nerve fibers, and cerebrospinal fluid pass.

This is also to illustrate the unwillingness to subscribe to any dogmatic belief, to encourage creative, courageous and imaginative investigation, to emphasize the necessity for unknown factors on all levels, and to point out the heuristic nature of this schema.