I can't remember what they call the concept that every object has a perfect example.?

In philosophy class years ago I remember reading a paper about how everything has a prime example of itself. For example a there are many variations of a chair but there is one perfect example of a chair. Although the prime example doesn't really exist it's like a template, an abstract idea of what a perfect representation of said object would be.





I can't remember more about it and it's killing me.I can't remember what they call the concept that every object has a perfect example.?
Plato's theory of forms?

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