While making a clock, if you add a redstone signal and both pistons are hooked up they will make the piston disappear.
To see more clearly it is featured in this video: http://www.youtube.com/watch?v=2DvlBdPpoHY
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duplicates
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Duplicate of MC-631.
Duplicate of MC-5774, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.