magnets

I think magnets can be add in minecraft. It has an ore and you can find this ore near of the centre of world. If you make a magnet block with this you can do some redstone systems. For example you put two magnets together and one of them push another one and you can do an elevator.

(If we right click on the magnet, it be north mode or south mode)

And we should do another block that which one do not move if there is a magnet nearby of it.