Excursion Funnel
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An Excursion Funnel is a new type of technology introduced in Portal 2. This mechanism create a funnel of energy in which the player may enter and exit at any time. It seems to defy the laws of gravity, allowing any who enter to become weightless and travel along the path of the funnel. Anyone caught inside the funnel cannot go backwards willingly. Only by reversing the flow of the Excursion Funnel, usually through a button that activates the reversal of the funnel.
The funnel can also act as a mode of transportation for objects across large gaps, as well as gels. Gels caught in the Excursion Funnel are slowly forced along a path until it collides with a wall or the funnel suddenly disappears, making it excellent for covering large areas in a short amount of time. Turrets coated in Repulsion Gel are instantly thrown into the air, bouncing helplessly until they shutdown.