What are playing cards?

Are they just pieces of paper? Are they just a simple object?

Well, there may be multiple answers to this abstract question. I can compare it with a book, because both have a deep meaning behind, an untouchable one. For me, a deck is much more than cut sheets of embossed paper. A deck is much more than just a material product. It's much more than a crushed stock and much more than a varnish coat. In fact,

a deck is a powerful tool of art expression