The Wheel And The Pattern
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What is the Wheel of Time? Imagine a great, cosmic loom in the shape of a seven-spoked wheel, slowly spinning through eternity, weaving the fabric of the universe. The Wheel, put in place by the Creator, is time itself, ever turning and returning. The fabric it weaves is constructed from the threads of lives and events, interlaced into a design, the Great Pattern, which is the whole of existence and reality, past, present, and future.

Within the influence of this Lace of Ages are not only the earth and stone of the physical world, but other worlds and universes, other dimensions, other possibilities. The Wheel touches what might be, what might have been, and what is. It touches the world of dreams as well as the world of the waking.

In this world there is no one beginning or one end, for each spoke of the great Wheel represents one of the seven Ages, receding into the past and returning in the future as the Wheel spins, the fabric fo each age changing only its weave and pattern with each passing. With every pass the changes vary to an increasingly greater degree. For each age there is a separate and unique pattern, the Pattern of the Age, that forms the substance of reality for that age. This design is predetermined by the Wheel and can only partially be changed by those lives which make up the threads within the weave.

No one knows the length of time it takes for a full turning of the Wheel, nor is there a set time for each Age. There is only the certainty that all will come around again, though surely long past the span encompassed by human memory, or even legend. Yet that knowledge provides the basis for the philosophy and history of the known world. No ending, even death, is necessarily  final within the turning of the Wheel. Reincarnation is a part of the way of the world. Prophecies are believed and heeded, since they tell as much of what was as of what will be. The only questions are when and in what manner the prophecies will unfold.
In such a world change is simply a predetermined part of the mechanism. Only a few individuals, special souls known as ta'veren, can cause the fabric of the pattern to bend around them, changing the weave. These ta'veren are spun out as key threads around which all surrounding life-threads, perhaps in some cases all life-threads, weave to create change. These key threads often produce major variations in the Pattern of an Age. Such major changes are called, in the old tongue, ta'maral'ailen, or the "Web of Destiny."

Even the ta'veren and the Web of Destiny woven around them are bound by the Wheel and the Great Pattern; it is believed that the Wheel spins out ta'veren whenever the weave begins to drift away from the Pattern. The changes around them, while often drastic and unsettling for those who must live in the Age, are thought to be part of the Wheel's own correcting mechanism. The more change needed to bring the Great Pattern into balance, the more ta'veren spun out into the world.

The Great Wheel is the very heart of all time. But even the Wheel requires energy to maintain itself and its pattern. This energy comes from the True Source, from which the One Power may be drawn. Both the True Source and the One Power are made up of two conflicting yet complimentary parts: saidin, the male half, and saidar, the female half. Working both together and against one another within the True Source, it is saidin and saidar which provide the driving force that turns the Wheel of Time.
The only known forces outside the Wheel and the Pattern are the Creator, who shaped the Wheel, the One Power that drives it - as well as the plan for the Great Pattern - and the Dark One, who was imprisoned outside the pattern by the Creator at the moment of creation. No one inside and of the Pattern can destroy the Wheel or change the destiny of the Great Pattern. Even those who are ta'veren can only alter, but not completely change, the weave. It is believed that if he escapes his prison, the Dark One, being a creature or force beyond creation, has the ability to remake the Wheel and all of creation in his own dark image. This each person, especially each of those born ta'veren, must struggle to achieve his or her own best destiny to assure the balance and continuation of the Great Pattern.