Disappearing Redstone Block type (New Block)

A type of redstone block that has, as usual with redstone, two states. In the unpowered state, it is a nondescript looking block with a pattern that fits in with most wood & stone builds ... similar to a redstone lamp that is off. In the "on" state it becomes similar to an air block. Players & items & mobs would pass through it like air. It would be almost invisible but targetable with an outline, like barrier blocks. It would also be able to transmit redstone power from one block to the next, up to 16 blocks in any linear direction with a 1 tick delay built in (So as not to overwhelm processing power) This would allow for air bridges and disappearing doors that so many players and servers wish for.