The principle of purple hand shadow dance is that dancers use the light band and reflection principle of stage-specific purple light to wear black clothes and masks, bright white gloves and props. When the stage and performance environment are completely dark, with music, multiple dancers' hands are used to build various shapes, and specific patterns can also be outlined with props.

Extended information:

Introduction of Ziguang Hand Shadow Dance:

It relies on gestures to express what it wants to show. The whole content of its performance depends on the change of hand movements to form various images, and relying on special lighting effects, the actors perform through the combination of hands and the form. In the secluded and tactful background music without dialogue lines, you can change all kinds of expressions, words, icons, patterns and all kinds of pictures in the world with one hand

Baidu Encyclopedia-Ziguang Hand Shadow Dance.