Novel block (No idea for a name)

This will be an ENTIRELY new block. The premise of the block is simple. Characters and mobs can pass through the block (like air) but items (in item form) can NOT pass through. For those of you who may read this, please suggest a name in the comments. Nothing comes to mind for me...

The entire point of this block is to optimize farms. I don't think this type of block should have a visible texture (like the void block) when not being held.