A magician I know talks about the three kinds of magic: sleight of hand, mechanical, and mathematical. The first requires a lot of skill and practice (e.g., palming coins, manipulating cards). The second requires a lot of preparation and engineering (e.g., sawing a person in half, floating person illusions). The third relies on the nature of reality (e.g., dividing sets of cards in a known pattern that forces a result, or manipulating numbers that force an unexpected result).
So this is a cool example of the second type. All three types require some showmanship, and good patter. Some of the best tricks combine the types.
Mathematical are often the "easiest" to learn, though they can be the hardest to "sell" when performing, because you have to play ups the magic and downplay the math (often forcing the "numbers" used is a great way to mask it.
Mechanical involves some training and skill to exercise well.
But above all I put the sleight of hand as the hardest to execute but the best when done well, especially added as flourish on top of the others.
So this is a cool example of the second type. All three types require some showmanship, and good patter. Some of the best tricks combine the types.