This painting is part of The Train series. The hybrid of man and machine confined into a narrow frame signifies the life of modern people. The train itself is a closed and mobile space; its interior space is sensitive to the constant changes in its exterior environment. In this sense, it seems to be an ideal metaphor for one's life journey. Throughout our life, the interior space of our minds are constantly influenced by the exterior environment. No one can obtain a complete picture of it until it reaches the final destination.（Yen Ching-chieh）