Lightsabers are the coolest part of any Star Wars movie.
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And most of the Jedi have blue or green blades.
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Apart from Samuel L. Jackson's Mace Windu.
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Windu's purple lightsaber came from the mind of the actor himself.
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And has previously been explained in Star Wars wider media, now non-canon.
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A new novel called Master and Apprentice offers a different theory.
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The book sees Obi-Wan explain that Kyber crystals adopt traits of their owners.
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And Windu isn't the only Jedi to wield a purple blade.
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