"If it was magic, it would look like 3 Fly, Shadow Coins or The Hanging Coins."
Counter-intuitively, cover can make an effect much more magical...the egg-bag vs. a barehanded vanish of an egg...or, for the most compelling example I've seen, if you spend some time with George Parker from the Netherlands -- ask him to do the jumping rubber band...he has a brilliant, simple touch that elevates it to something that looks like it could be on a Copperfield special...
It's for the same reason that a scary movie can be far more frightening when you don't see what's coming for you, or why the right skirt can be more enticing than a naked body, or why several faiths strictly prohibit making any visual depiction of God
Once you have an image of something -- the coin is at the fingertips in this hand and it is immediately at the fingertips in the other hand -- that's it. You have given it a specific form and it will never be more wonderful than what you saw.
Once you show the monster, I can imagine more terrifying; once you lift the skirt, I can imagine more beautiful; and once you draw God, I can imagine more perfect.