Valve has rolled out the second and third parts of its seven-part E3 video demonstration of Portal 2. (Did you miss Part One?) Today, we're introduced to the "Excursion Funnel" and "Aerial Faith Plate" (posted after the break).

Remember the first time you figured out how to "fling" yourself in the original Portal? Remember the Keanu Reeves-ian "whoa" it elicited from you brain? Yeah, you're about to experience that all over again. Watch.