We had fun today on Minecraft with the Observer blocks, Sticky Pistons and Slime (and the odd cow)
Also some crazy glitches like vanishing buttons, slime that doesn’t stick, indestructible cows, pistons speeding up and stopping for no reason!
To build the machine :
Observer block , Stick Piston , Slime , Slime
Slime, Slime, Sticky Piston , Observer block.
That is it just make sure the OB points to the piston.
Perpetual motion is a wonderful thing.