Here's why the writer talks about it:
* Symbolism: The vine represents life and hope. Just as the ivy clings to the wall despite the harsh weather, Behrman clings to his own life, despite his illness. The vine's resilience is a source of inspiration for Johnsy, the sick young artist who believes her life is tied to the vine's survival.
* Behrman's Sacrifice: The vine also symbolizes Behrman's ultimate sacrifice. He paints the leaf, even in his weakened state, to give Johnsy a reason to live. His act of love and dedication ultimately saves her.
* Themes of Art and Life: The story explores the connection between art and life. Behrman's painting becomes a powerful expression of his love and compassion, ultimately impacting the lives of those around him.
* Metaphor for Artistic Inspiration: The vine's beauty and resilience can also be seen as a metaphor for the creative inspiration that fuels Behrman's art.
In essence, the "masterpiece" is more than just a painting. It's a symbol of life, sacrifice, artistic inspiration, and the power of hope. It is a powerful testament to the human spirit and the ability to find beauty and strength even in the face of adversity.