The slanting door shoe means the center of gravity of the shoe is inclined to the outer side, causing the asymmetry of the inside and outside of the shoe, belonging to the asymmetric door structure, commonly known as "crooked door".

The asymmetry between the inside and outside of the shoe and the difference between the inside and outside is not a concept. In order to make the shoe symmetrical, it is necessary to make appropriate adjustment according to the difference of the last face, which is called the difference between the inside and outside.

If you consciously turn the center of the shoe outward to the side of the shoe, there will be a strong contrast between the inside and outside of the shoe line, which has a strange feeling. This is called asymmetric inside and outside, as shown in figure 3-2-13.