World
We travel through the mind of a mentally disabled cardists that has gone insane from having developed thousands of cardistry cuts.
One of the lead doctors on his case is a cardician. He has been looking to dig inside his head ever since he's heard that the flourisher has been assigned to him. When all the other doctors are away, he connects the patient to the machines and travels through his head.
Here he is greeted with a world developed entirely around playing cards and the cardistry community. The people inside his mind are all cardists from instagram. They are all wearing cardistry inspired clothing.
Currency features faces of famous cardists.
The religion in the city is revolved around how cardistry created the world (because for them, the patients mind, it really is this way).
How people come from playing cards, and not from apes or God.
There are human vinyl players in restaurants where the player itself is a cardist and the vinyl you load is a pack of playing cards. Once he or she starts performing with the deck, music comes out of thy's mouth.
Developing it
If you write this, feature it with drawings. Seeing this sort of world with your own eyes can be fascinating to examine (especially if you are a cardist).
Next time you write an instructional Cardistry Book, feature a story like this and you can hook your reader not only on the flourishes that you are teaching, but also on the story and the world you are creating.