how to make invisible shelves for the hallway, above the doors? Answered

I have plans for a floating style shelf made for hallways:
mikemates.com/hallway-cook-book-shelf/

Invisible Book Shelf

Invisible = transparent? Glass or plexiglas.

Invisible = hidden? Lower the ceiling to the level of the shelves, with a hatch/door/something for access.

Invisible = floating? Type "invisible bookshelf" into the "Search" box at upper right - there are a couple Instructables on those.

Whatever you do, make it sturdy enough so that nothing will come falling down onto your head if you slam the door. :)