Piston
block, which can affect other blocks, pushing them in the horizontal and vertical direction to the side where it has its front side.
The pistons are used for the movement of blocks (12 blocks in either direction), but they may also act on other objects such as players or objects.
Pistons can not push the blocks that have dololnitelnuyu information stored separately from the array of game levels, and obsidian blocks portals and bedrock. One piston can push the other, if the compressed.
Some units, such as flares or pumpkins, when you try to move the piston fall as objects.