Constructed by Youtube channel HeroTech, this is a lightsaber that extends and retracts in a manner that looks convincingly like the real (fictional) thing. The blade extends thanks to a coiled sheet spring, the same tech that’s used in a magician’s magically extending cane. The result is quite impressive, and, while not as fast as the sabers in the Star Wars universe, it is still a treat for the eyes. I love eye treats, because most of what I see are just eye vegetables. The sort of sights a kid would leave on their plate at dinner even when threatened with no dessert.