This giant (10,4′ x 13,9′) and unfinished painting hags in the Alte Nationalgalerie (engl. Old National Galerie) in Berlin.
A few years ago I visited the museum to study the works of Menzel and I saw two women in front of the painting. The older woman told that the painting is about Frederick the Great holding a speech to his generals before the battle. She told which persons were planned for the still unpainted places and which of the already painted persons will not survive the battle. And she was crying.
I will never forget this moment because it showed me the power of art. Art gives us the opportunity to take it as an example and teach someone else about us. And even unfinished Art is able to touch our empathy and let us feel.