Modular gate

A modular gate is a block that retracts in to a very thin plate, thinner than a pressure plate.

if you place on onto an other and click one, the other(s) will retract as well.

If you place some that are facing each other (the black and yellow stripe is on the front) and click one of them, all the others will retract.

Modular gates do NOT react to neon energy, or redstone current.

They do not require energy.