Function and material design of gobo discs

It is a metallic or glass disc that is inserted into a lighting device (such as a spotlight or light panel) and shapes the light beam into the desired form.

Gobo in Practice

The term "gobo" refers to any device in studio photography that casts a shadow, as well as various pieces of equipment that go in front of the light (such as a gobo arm or gobo head). Gobos are typically made from metal or glass and have cut-out or engraved patterns, images, words, or other shapes.

Once the gobo is placed into the lighting device and the light is turned on, the light beam intersects with the gobo, creating a shadow in the shape that is designed on the gobo. This allows for the creation of various effects, such as text, images, colored shapes, and animations.

Gobos are used in theatrical and film production to create different atmospheric effects and to enhance the scene.