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This Chamber Sucks (Hairpin Portal Canal)

Did you know that Observation Windows and Test Chamber Doors count as platforms? I sure didn't. By doing hairpin turns in air and/or standing on Observation Windows, you can (somehow) beat this terrible chamber. Just remember that your portal counts as a very small platform, and pushes you out of it if you're in it when it changes.
Don't play this one unless you actually want to learn hairpin jumps.
My record is 4 portals, by the way.