What is the biggest difference between sculpture and painting, photography and calligraphy?

In plastic arts, the biggest difference between sculpture and painting, photography and calligraphy is that sculpture creates a solid image in three-dimensional space with material materials. Painting, calligraphy and photography all create a two-dimensional plane image. Therefore, appreciation of paintings, calligraphy or photographic works can only be seen with visual senses, and often must be seen from a fixed angle.