Having always had a curious mind and, later, upon grtowing up to discover that there is no real magic, I tended to avoid magic shows because I wanted to know how the tricks worked, but no one ever told us how. Unless they were real simple, worn out ones.
When someone published a book on tricks, I read it and learned about mirrors, hidden pockets and such and was actually disappointed.
I have a deck of marked, trick cards, cut at a bias one way and hidden marks in the complex design on the backs. If you ‘stack’ the deck right, the design not only tells you what the top card is, but another card deeper in the deck.
They take a lot of study to be able to use them right.