The invisibility cloak that Harry Potter wears in J. K. Rowling’s books is woven from the hair of a magical creature. But in the real world, the magic of invisibility is not dependent on fantasy, but rather on science and engineering.
Then there is quantum stealth technology that uses colouration patterns to hide objects in plain sight.
There are even camouflage technologies that make something as large as a tank appear to be local foliage, absorbing the characteristics of the organic and inorganic materials found on a battlefield.
As cool as Harry Potter’s cloak of invisibility appears to be, current and future materials science discoveries and technological advancements may have it beat.
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