Floating Banner

Floating banners can be created by:

• Placing a trapdoor on a wall
• Ensuring the trapdoor is in its horizontal state
• Shift clicking on the trapdoor with a banner in hand
• Clicking the trapdoor so that it's in its vertical state

This creates a wall type banner that appears to be floating.
Possible solution could be to drop the banner when it is no longer supported, much like how signs drop.