Minecraft - Mobavator Junction

[gmfreaky]

This is kind of an outdated video, before pistons were released.

Anyway how it works: a waterstream pushes the mobs to the side, but if the trapdoor on the side is closed, they continue going upwards.

[NortheastGamer]

Not very good at explaining how it or why it works on the inside and what one would even use this for.

[Thebobsmccoll]

Nice