Exit the corridor in which you find yourself and walk down and around the upside-down floating island to a small structure with four doors. This is the inverted shrine. Behind one of the doors is a short lever on the ceiling (actually the floor, since this chamber is upside-down). Pull the lever to unlock the magically held door, and behind the door is a blue obelisk. Click on the obelisk and you will be transported to the next maze.