when you fly in a old world to a particular high (exact y:135 or 136) , Next to end of the world (Barriers) , (and you enable hide GUI) the game its like multiple reflection and in several places, such as the eyes of a spider or a glass crushed , but when you go to game menu the reflection disappear...

my old world seed is : 97908
samsug galaxy s4
4.4.2 (kitkat)