Here's why:
* No Evidence: There is no concrete evidence about the man's identity. No records exist of Manet naming him, and no contemporary accounts mention who he might be.
* Speculation: Some theories suggest he might be a friend of Manet, a patron, or even a self-portrait of the artist himself. However, none of these theories are definitively proven.
* Intention: Manet deliberately left the man's identity ambiguous, adding to the painting's sense of mystery and inviting viewers to speculate. This was typical of Manet's style, as he often used his paintings to explore themes of modernity, social class, and the complexities of human relationships.
The anonymity of the man in the background enhances the painting's intriguing nature and adds a layer of depth to its narrative. It's up to the viewer to imagine his story and the reason for his presence in this vibrant, yet isolated, scene.