Katsuki thinks cubic shape artificial, thoughtful and philosophical against sphere shape which may mean the earth and space.
He creates cubic art pieces for life work as his heart anchor.
These 3 cubic arts are also from his mind. They are carefully chamfered to be different from each other. He tried cracking with coated ceramics before fire and putting glasses and copper boards on the surface of cubes to be unique so that the observers can feel rhythm and movement in their hearts.
Place and arrange the 3 cubes flexibly for your style.