Minecraft wiki entry for Zero-ticking, associated text: Normally, when you power a sticky piston with a block on it towards an entity, and the entity has enough room to move, it will be pushed by the block. Zero-ticking a block places it over the space occupied by the entity without moving the entity. This can be used decoratively, e.g. creating 1-block glass 'display cases' with entities (mobs, armor stands) inside, or offensively, causing mobs to suffocate if using solid blocks, or in contraptions where you can overlay an armor stand and a solid block within the same space, e.g. for vertical signal transport using piston and tripwire, crossing with horizontal transport through the block. This can easily be done by placing a button on the side (not the back) of a piston. This will power the piston and the piston powering will instantly break the button causing a 0-tick pulse.