The story begins in a  setting which is Gray, Grayer and Grayest. Gray is the color of potential Recursion. Recursion brings things back on themselves. The positive become more positive and become stronger and the negative become more negative and wipes itself out.   Recursion   Tetractys

Those who live merely in order to survive are mortal, age, grow gray and die. ”It was Toto that made Dorothy laugh, and saved her from growing as gray as her other surroundings." Dorothy lives to love and remains bright and loving. Recursion brings things back on themselves. Its motion is self referential, circular. Along comes a circular whirlwind of Recursion.

Henry runs to save the stock, Em runs to the cellar. Toto runs under the bed. If Dorothy had run for the cellar she would have lost Toto and then even if she survived she would have grown gray, aged and died. But she put love first and was carried away from her land of death by the Cyclone.
And came to Oz. The Cyclone lands the house on what is a very negative thing in Oz, the Wicked Witch of the East. She was recursed to dust.

Oz is Tir nan Og, pronounced Tay nan Oz. It is the fairy realm which is the reflection of Erin. Erin is archetypically divided into five parts. There are monarchs of the East, West, North and South. And the ruler over all in the middle. Oz is the same. Or would be were it not for the wicked witches.

In the mundane world the flow around the center is clockwise. From the Purple Void at the North, life enters at the Green East by sex and birth, operates by the restrictions of Limits in the South Yellow and leaves at the West Red by Death and goes into the Purple Void at the North. The constraints of time and place are the responses of the Orange Control Below guided by the morals, ethics, manners and customs of the Blue Rulership Above. The inhabitants live in the Clear Center and make such choices as they can.

The progression is North to Below to East to Center  to West to Above to South. The dark side of the Tetractys to the light side. Dark bottom to bright top.
Purple to Orange to Green to Clear to Red to Blue to Yellow.
The sequence of colors is the apparent speed of movement of the seven planets which is Evolution with the Sun at the Center.

In addition...
Causality with the Sun at the Center defines Invention
Recursion with the Sun at the Center defines Dream
and Recusion with the Sun at the Center defines Magic

Faerie is a topsy turvy land to Mundania. It is upside down and so reversed. East is West and West is East. It is a land of Active Recursion, flow around the center is counterclockwise.
The progression is the same as Mundania. North to Below to East to Center  to West to Above to South. But the sequence of colors is that of Recursion and the Sun cannot be at the center because Faerie is a reflection of Mundania. The Sun has to be as central as it can get, either Above or Below. Above is Heaven and Hell, Below is Faerie.

The sequence of colors is Purple to Clear to Blue to Green to Yellow to Orange to Red which is the sequence of colors of the Rainbow which is the path of Recursion.

The flow around the center is counterclockwise. From the Purple Void at the North, life enters at the Blue East by Always-has-been to the appropriate society (found under a cabbage leaf, whatever), operates by Narrative resolution of Conflict of the Red South and Remains forever or is rendered inoperative by the Limits of the Yellow West and if inoperative returns to the Purple Void of the North. Freedom of anything is the constraint of the Clear Below and the guidance of Control by custom and magic is the Orange Above.