in an earlier blog I posted that Herobrine was a glitched human NPC but we weren't sure well after travelling back to the original minecraft versions ( including Beta and Alpha ) we can confirm most of this in classic minecraft you could spawn a person by pressing 'G' on the keyboard well after they deleted the ability to spawn them humans became randomly spawned ( they didn't remove humans until a few updates later ) well from a distance the humans didn't look like they had eyes so there you go. a randomly spawned human who is always seen in the distance so you cant see his eyes so there you go.