There is a Piston mod that is PROBABLY going to be added to the game,
Basicly it adds a block that extends when you power it with redstone, it can shoot players / items / sand / gravel an push other blocks.
While not sounding too exciting from just that, ppl have made regenerating walls / bridges with it, hidden bookshelf-entrences. Transportation systems... I suggest you check youtube for more information :smile.gif:
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