It is a poetic boundary interwoven by contours and lines, outlining the form and hiding the imagination. It is smooth and simple, combining hardness and softness, wandering between light and shadow, telling the language of design. Sometimes sharp, sometimes rounded, each line is a dialogue between space and structure. The outline is not only a display of the outer shape, but also a revelation of the inner rhythm. It outlines the beauty and leaves infinite aftertaste for imagination.