Loose Id, scored for orchestra (piccolo, 2 flutes, 2 oboes, 2 clarinets in B-flat, B-flat contrabass clarinet, 2 bassoons, contrabassoon, 4 horns in F, 3 trumpets in B-flat, 2 trombones, 1 bass trombone, tuba, timpani, percussion (3 parts), violin I, violin II, viola, violoncello, and contrabass), is an abstract realization in sound of the energy of the Id. Unleashed, without the counterbalance of Ego or Superego, the Id generates unbridled instinctual energy, resulting in an orgiastic frenzy. Distinct from a state of dementia, this piece represents a thoroughly lucid and intentional rampage of self-indulgence. The accompanying essay examines the underlying structural principles of Loose Id, focusing on how they aid the creation of the overall experience of the piece. Particular attention is given to the concepts of linearity and nonlinearity and their roles in different levels of creative and listening processes.