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-Go to your right, to a small room with a pedestal switch and a button.
-Press the switch and step on the button.
-Shoot a blue portal at the excursion funnel and an orange portal on the surface above it, which turned portalable because you're standing on the button.
-Wait until the cube will reach the beginning of the funnel. Then, wait until the switch turned off.
-When the cube gets to the blue portal (which is closed), shoot an orange portal on the white tile on the floor.
-Step off the button and catch the cube, which should now be trapped in an infinite loop.
-Place the cube on the button and return to the excursion funnel.
-When you reach the main excursion funnel, shoot an orange portal on the surface above it.
-As you fly in the extended funnel, shoot an orange portal on the floor tile when you reach it.
-Fly up to the higher floor.
-Shoot a blue portal on the far wall.
-Jump down, carry the cube through the portal to the higher floor and place it on the final button.
-Proceed to the Chamberlock.