Bitcoin is a peer-to-peer electronic currency, just like Satoshi said. When people start calling it something else, like "a swarm of digital hornets", "digital gold", "art", "revolution" and so on, it suggests that it isn't doing well as currency, because otherwise people wouldn't need to create new narratives of what Bitcoin is.
As for art, wikipedia defines it as:
Art is a diverse range of human activity, and resulting product, that involves creative or imaginative talent expressive of technical proficiency, beauty, emotional power, or conceptual ideas.
And Bitcoin is neither of those things, it's simply a tool for storing and transferring value online.