Board Thread:Fanon Canon 2/@comment-25152698-20140927001831/@comment-25152698-20141002220820

And to reply to Dal, we've seen many living 'eye donors'.

Madara took his rinnegan from Obito. Madara took Obito's sharingan from Kakashi. Rin took Obito's sharingan for Kakashi.

We've seen it, they don't have to be dead. The eyes however, must be preserved for long term usage.