This sticky piston based enchantment room have 2 levers
the first is in front of your save point and in someone thinks that this is a trap with lever they would just destroy 2 blocks (piston door) near the lever they will find 1 enchantment table they will think huh nothing to do.
when you push the first first lever the bookshelves will not appear they are not wired together but they are wired with everything except the bookshelves (redstone repeater doesnt allow them to). Dont close the wall with first lever use the second inside the room it will close the wall and push out bookshelves.
if you are curious about the mechanism go behind the wall and/or dig under the second lever and under the redstone that is under the lever remember to put them back in order to work

By Yirkar