Dorothy and the Wizard appears to be in the order of Transformation, Purple Orange Green Red Blue Yellow

The self reference of awareness distinguishes relevant and non relevant but not good and evil.
The self reference of knowledge solves good and evil but does not deal well with true and false.
The self reference of understanding aces true and false but is ineffectual when faced with resolvability.

Consider the definition - "That which cannot be defined in any way whatsover". It is definately a definition, but what does it define?
Not undefinability by characteristic. That would be data that's too fuzzy, indistinct, overlapping borders etc. That sort of undefinability is easily defined.
No, that sentence is saying that what it says cannot be said. Undefinable per se.
It could also be stated as "That which can not be referred to in any way at all". It is a reference but what does it refer to?
It's rather like the street sign that says "Nameless Street". Is it that the street has no name? Or is "Nameless" the name of the street?
And if it's "Sans Nom" and you don't speak any French is "Sans Nom" the name of the street until you learn French and then the street doesn't have any name?
Is there a concept which is inherently undefinable and cannot be referred to in any way whatsoever? And didn't I just refer to it?
That concept surely exists but it must non-exist without actually non-existing.
In Theosophy that concept is called Recursion and is the single axiom that Theosophic Ontology is based on.
Recursion is what the self reference of understanding does not understand and thus is the problem met in the Land of Naught.

(( Resolvability is today's hot problem in mathematics, philosophy and theoretical physics. ))

In the context of Blue then, the following is a secondary sequence of Transformation.

Blue / Clear - (recognition of transition) the inherent underlying Void. They view the black sea of causal chaos and meet the man of emptiness - parallels - if our existence comes from nothingness, then isn't that our eventual fate? And isn't personal survival after death wishful thinking and an illusion? And couldn't everything have come into existence a moment ago just as it is now and how would we know the difference if it did? And how would we know if we were a computer simulation in the Matrix?

(( If the man had used a better packing algorithm for those post holes he could have nested them rather than stacking them and so stayed in Maine(?) the dairy state of the time, and continued making superior holes for swiss cheese. Here in Wisconsin we store swiss cheese holes in swiss cheese and so avoid packing problems entirely ))

Blue / Purple - (recognition of void) the Land of Naught where all is deadwood, even the trees. Trees made of wood with leaves of shavings and a coarse bark like surface. Considering that the wooden birds were flying around and the wooden cows were grazing on the wooden splinter "grass", it's fair to suppose that those wooden trees function as trees in some fashion rather than just being carved to resemble a tree. And yet are wooden. Wooden trees rather than trees of wood. Zombie trees.  A zombie countryside. - parallels - thoughts appear to come from nowhere and go nowhere. They have no substance or apparent duration. By the time you're aware of them they are already over. Thoughts come and go and if unconstrained can be any thing at all.

Blur / Orange - (recognition of response) instant antipathy, inherent contradiction. The silent living dead meet the noisy living mortals - parallels - when allowing ones thoughts to be whatever they care to be and to observe them without involvement, somtimes those thoughts are self contradictory and sometimes they are incomprehensible. Understanding can deal with the self contradictory if it's not too complex but the incomprehensible is really incomprehensible.

Blue / Green - (recognition of awareness) sound in the silence is their only real weapon - parallels - self contradictory thoughts sometimes involve themselves. Thoughts of present emergencies especially. They refuse to be merely observed, but take an active part in getting involved with the observer and then uninvolvement is lost. It's hard to be uninvolved with the thought that the chocolate cookies in your refrigerator are exploding even if you know you have no cookies of any kind there.

Blue / Red - (recognition of conflict) they lose the battle. They expect to be put to death but how would zombie gargoyles have any concept of death. They imprison them - parallels - what if your unconstrained thoughts turn on you?

Blue / Blue - (recognition of recognition) they are imprisoned but acquire wings from sleeping gargoyles - parallels - self contradictory, incomprehensible thoughts put a stop to any progress. Nothing happens or ever will. The only resolution is to use the capabilities of self contradiction to contradict self contradiction. Incomprehensibility brought back on incomprehensibility doesn't make it comprehensible, but rather, supportative. The incomprehensible supports the mind to use incomprehensibility to open new doors of perception, which is the point of doing this stuff in the first place.

Blue / Yellow - (recognition of limits / ends) they fly off to an escape hatch, light a fire and mess around with some doors. One path leads away from it all - parallels - the resolution of the limits of understanding and the examination of new ways of perception leads to a new void.