now before you go commenting "Oh you n00b , herobrine Isn't real!" , I know he isn't , and I don't think it was "Him" at all.
I was playing singleplayer creative offline , and I went to the End to test a mod I made, anyway as I was going to exit the End, I noticed this weird glitch/bug/structure, anyway I started to fly over to it to check it out, But It vanished.
I tried going back a bit to where it was before it disappeared , but it was gone for good.
I logged out of that world and then rejoined... And there it was again.
For some Dumb reason I went closer to it again, same result....
I did take a screenshot of it (the main image), before it vanished.
Idk , Weird.

If you have any explanation or similar experience let me know!

Squirrelock11 :)