The Rinnegan is translated into Samsara Eye.
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The Samasara consists of six realms : Preta, Ashura, Deva, Naraka, Human and Animal. These are called the "Inner Paths" as they are within the wheel of Samsara, The "Outer Path" represents the realm beyond the Samsara, i.e; Enlightment, Nirvana, etc.
So, it is actually this :-
Inner Path - The Realm of Samsara : Preta, Ashura, Deva, Naraka, Human and Animal
Outer Path - The Realm beyond the Samsara.
Except that Rinnegan can only be formed if you have both Yin and Yang as one. If Sasuke has only Yin, then he would have never awakened Rinnegan. He even got the source of Rikudou chakra which is always Yin + Yang = Rinnegan.
In before you throw in the databook, everybody has Yin/Spiritual Energy and Yang/Physical Energy.
The graph shows their dominant energy. Sasuke is Yin Dominant (Hence Yin on the graph), Naruto is Yang Dominant (Hence Yang on the graph), Madara is both Yin and Yang dominant (Hence Yin and Yang on the graph) and Hinata is neither Yin or Yang Dominant (Hence niether Yin and Yang on the graph). It's a mangafact that all human beings in the NV have Yin and Yang.