The theme is a simplified form of that day. Human memory is not perfect, and the shape of that important day is fading over time and simplified. Perhaps you will not be able to completely reproduce the past scene. However, the sense of "somehow" experienced at that time is accumulated in the brain. "It was fun," "It was hot," "It was hot," "It was cold," and so on, rather than visually experiencing colors and forms I think it is a strong memory. I simplified my “somehow” ambiguous memory into a simple form, like playing with blocks. The audience is also creating works that allow them to play "think what happened".