Sentientce & the Cards

[Nightbird]

Webster's Student Dictonary:
Sentient-Able to feel
My Example:Freedom is the right of all sentient beings-Optimus Prime
I read in the Manga about how the cards have different personalities,emotions.
Kero said that Windy is a gentle card,while Watery has an aggressive streak.

So if these things are sentient,why does Clow keep them in a book?
We know that he created the cards,but did he also create the spirits residing in thiem?

I sometimes play this old Castle RPG,and in the Bestiary it talks about the 'Elemental Planes',where different spirits of Fire,Water,Air,Earth & Hybrids roam.
Could that be where all the Clow spirits originated from?

[Cardcaptor Takato]

In volume six of the manga, Kerberos says that the Clow Cards are made from a mixture of Western and Eastern magic and that they are based on the five Chinese elements, wood, earth, metal, fire, and water.  Since Clow Reed also created Yue and Kerberos, I think we can safely assume that Clow Reed also created the spirits within the cards.  The Clow Cards were locked inside the Book Of Clow because they grew too powerful and out of control.

[Nightbird]

If the Clow Cards were based on Chinese Magic,where is the Western?Light & Dark...but those too are complimentary,not the traditional duality in Western minds.

This is the only thing which is beyond my comprehension in terms of fiction.In comics,mythology,Shakespere,HP,Tolkien,etc.Everything I have ever read except CardCaptor Sakura states firmly:Only the Divine can Create Spirits.