I know black Zetsu isn't literally her son, but bare with me.
First, Hagoromo inherited the Rinnegan.
Second, Hamura inherited the Byakugan.
Lastly, the "third child" *cough*spawn*cough* inherited the Sharingan. Now why the eye itself is not physical but, his "eye/s" have all of it's abilities. How else could black Zetsu record things and alter the Uchiha tablet? As you can see, his eye is about the size of the iris of the Sharingan.
So each one of her "children" inherited one of the San Daidōjutsu. Now, I have no clue how Indra got the Sharingan, perhaps it was a mutation when Hagoromo's power's were "split"? Perhaps black Zetsu had something to do with it? But, yeah. What do you think?
First, Hagoromo inherited the Rinnegan.
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Second, Hamura inherited the Byakugan.
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Lastly, the "third child" *cough*spawn*cough* inherited the Sharingan. Now why the eye itself is not physical but, his "eye/s" have all of it's abilities. How else could black Zetsu record things and alter the Uchiha tablet? As you can see, his eye is about the size of the iris of the Sharingan.
You must be registered for see images
So each one of her "children" inherited one of the San Daidōjutsu. Now, I have no clue how Indra got the Sharingan, perhaps it was a mutation when Hagoromo's power's were "split"? Perhaps black Zetsu had something to do with it? But, yeah. What do you think?