Dorothy and the Wizard in Oz
Dorothy and the Wizard appears to be in the order of Transformation, Purple Orange Green Red Blue Yellow
Supposing you were to watch a movie many many times. In fact you saw it so many times that you were very familiar with it but had not actually learned the dialogue by heart. Then a year or so later you saw it on TV with the sound turned off. What might happen is that as long as you could see the lips of the characters moving, you would hear a kind of soundless sound. No timbre, no volume and heard in your head not in your ears. Not lip-reading as you could "hear" the dialogue even if their heads were turned to the side and you could just barely see the moving lips. Call that soundless sound heard with the eyes a "virtual sound".
By using various techniques and exercises it is possible to develop virtual analogues to all of your senses. And, moreover, virtual knowledge and understanding. In fact you can develop a sort of heads up view of your surroundings simultaneous with your normal cockpit view. In videogame terms, a third person view to go along with your normal first person view.
At least that's the theory. The third person view would allow you to mess around with the cabin controls (biofeedback) and help you to avoid difficult situations by going around them or not doing something that you might have otherwise done.
That is what the path of Transformation is about. Personal change brought about by the appropriate exercises and experiences to change you from being an ordinary old 18 sense person to a more physically advanced 36 sense person.
Clear - arrival at Hugson's siding in the midst of violent upheavel - parallels - major dissatisfaction with the meaninglessness of one's life. Desire to find out what is really true and willingness to change. Taking the red pill rather than the blue pill.
Purple - falling into the void - parallels - beginning the practice of contemplative meditation and the stilling of judgmental thought, observing one's own thoughts without being involved in them.
Orange - stones and clay rattling around - parallels - one's thoughts not giving up that easily and demanding to be attended to. Uninvolvement not being possible.