Floating Redstone Torch on block removal

In creative AND survival (you should add an option for that as I have tested it it both); if you place a block down, place a Redstone Torch on any of the sides and then remove the block, the torch remains there.

NOTE: The torch does not update itself upon place a block (creating a block update) around it. It also does not have the same effect if you place the torch on top.