I don't know for sure. It might be based on a unique true story that's not widely known or perhaps a combination of several real incidents that have been adapted for the story.
One characteristic is authenticity. Since it's based on a true story, it has a factual foundation. Another is the tripartite structure which helps in organizing the story. For example, it can show a progression over time related to the story.
One possible theme could be love and loss. If the true story involves a relationship, the triptych could show the beginning of the love in one panel, the loss or hardship in another, and perhaps the acceptance or new start in the third. Another theme might be struggle and triumph. For example, if it's based on someone's journey to overcome an illness, the panels could depict the diagnosis, the fight against the illness, and finally the recovery.
Well, 'Triptych Based on a True Story' could refer to many things. It might be a piece of art in a gallery that uses three panels to tell a story that actually happened. Maybe it's about a historical event. The artist might have used their own memories or research about a true event to create this triptych. It could also be a creative take on a personal experience, like a journey or a relationship, where the three parts of the triptych each represent a different aspect or stage of that real - life story.