Light and shadow serve to emphasise their surface and material quality give them contour and model them in the surrounding space. The position of the light source enhances the effect of curves and edges: for example through the different character of vertical or horizontal shadows. Sculptures made of precious materials such as crystal glass polished marble or porcelain can be accentuated to great effect and brilliance by using different brightness levels and a high point luminance. Source: https://www.artikelschreiber.com/en/.