The narrative around the identity of the mysterious woman in Leonardo da Vinci's Mona Lisa has often oscillated between clear fact and enigmatic folklore. Could this iconic portrait, which today hangs in the Louvre, indeed depict the wife of a Florentine merchant, Lisa Gherardini, or is there a deeper, concealed story yet to be unraveled? To assert that the Mona Lisa might be a concealed self-portrait of Leonardo himself, or perhaps an embodiment of an idealized woman, would border on historical audacity. For one to believe in such hypotheses, one would need to counter the prevailing historical documentation with mere speculative anecdotes. 

One of the primary challenges in ascribing the identity of the Mona Lisa to someone other than Lisa Gherardini lies in questioning the purpose behind Leonardo's deviation. Why would Leonardo, a noted polymath of the Renaissance, create an emblematic masterpiece and then shroud its subject in mystery? Additionally, embracing an alternative theory would necessitate believing that the countless scholars and historians who've studied Leonardo and his work might have overlooked or misinterpreted crucial evidence. Moreover, would not someone from Leonardo's inner circle, or Leonardo himself, have hinted or documented this anomaly? 

Such fanciful claims might originate from modern-day infatuation with conspiracy theories or a desire to inject fresh intrigue into well-established historical events. For instance, some theorists point to Leonardo's well-documented love for codes and hidden messages, suggesting that the Mona Lisa is replete with clandestine symbols. They argue that since Leonardo was an aficionado of mystery, the very identity of the portrait’s subject might be one such enigma. Additionally, others suggest that the Mona Lisa's smile is too enigmatic, too knowing, to belong to a merchant's wife, indicating perhaps a deeper connection to the artist. 

However, while fascinating, such perspectives often arise from a misjudgment of the Renaissance era. The Renaissance wasn't merely a period of art and beauty; it was a time of exploration, both external and introspective. Artists frequently delved deep into the human psyche, aiming to capture emotions, thoughts, and feelings rather than mere physical resemblances. The Mona Lisa's elusive smile, rather than hinting at a concealed identity, might simply be Leonardo's exploration of subtlety in human expression. A challenge, if you will, to his audience to discern and interpret the layers of human emotion. 

Ultimately, as with Shakespeare's works, the fascination surrounding the Mona Lisa should perhaps be centered less on the identity of its subject and more on the artistic brilliance and profound emotional depth it encapsulates. After all, isn't it more rewarding to engage with the art itself than to endlessly speculate on its origins?