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https://youtu.be/a8GDWsZqYm4
1. There are 5 input mechanisms that trigger ceiling tiles. 1 button, 1 laser catcher and 3 laser relays. The ceiling tiles will trigger the lightbridges and they will guide you through the air.
2. Shoot portals on both ceilings above the buttons in the upper rooms while the cube lays on the button inside the grating cage. Jump to the chamber with the pedestal button by using the lightbridges, retrieve the cube and place it on the second button. Jump onto the cube to jump into the grating cage to stand on the first button. Retrieve the cube to build a stepladder to escape from the cage.
4. Once you have unlocked the second laser emitter on the ground level (inside the room with the button that triggers the exit door), you need to trigger two laser relays to set up the final ceiling pattern. The final step requires you to shoot two new portals.