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Reflection Gel, which first shows up in Portal 3, is a gel that works very much like a mirror or discouragement redirection cube by redirecting thermal discouragement beams. It can stick to walls, floors, and ceilings made of solid material. When a beam hits the surface, it reflects it at whatever angle it's pointed. Unlike the discouragement redirection cube, it cannot be moved, thus adding more challenge to some test chambers.