This was created for the purpose of removing a cobblestone block, and replacing it with lightstone. I achieved the intended effect, but at the cost of space and redstone. I was just wondering if there was a better way to do this without all of that.EDIT:Improved Version
@smp exactly, i made a secret door for my friend, complete with xnor gate to have it controlled by two switches, and he asked for a light switch system too.
The pistons allow for some pretty neat temple/dungeon creation, making indiana jones styled traps and such XD
Pistons remind me of Portal. Speaking of which, that portal mod looks kinda cool.
Heh, I was actually able make a shrinking room, so it was like a test chamber :P
Pistons + Redstone + Netherrack = Victory candescence.
That shrinking room build sounds awesome. Imagine the possibilities of this, plus the portal texture pack, plus the portal mod.