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I'm not sure where else to ask this since I'm not very familiar with this area.

What is the backdrop of a theatre play act called?

Like when the actors are behind the curtains and their silhouettes are instead flashed on the white screens or curtains. The play or act is all going on in the background just like a puppet play...

What's it called? May I please know if this really is a thing or not?

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  • The sheer scrim, as below, is at the stage front with light behind it. The backdrop is at the back as scenery. Commented Aug 20, 2023 at 1:34
  • Backdrop isn't the right word for what you're asking. Literally it means a flat piece of scenery lowered from the fly-space to provide a painted background to the on-stage action in front of it. That representational approach to theatrical scenery has lost a good deal of its currency since the eighteenth century, so that now the term is usually metaphorical, a mere synonym for background. The special scrim effects that you are asking about, however, involve a scrim that is in front (downstage) of the actors, not behind them as the back part would imply. Commented Aug 20, 2023 at 12:56

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The screen used for lighting effects in theatres is a scrim or gauze.

Wikipedia explains as follows:

A scrim is a woven material, either finely woven lightweight fabric widely used in theatre, or a heavy, coarse woven material used for reinforcement in both building and canvasmaking. A scrim or gauze is often a very light textile made from cotton, or sometimes flax or other materials. It is lightweight and translucent, which means it is often used for making curtains. The fabric can also be used for bookbinding and upholstery.

Scrims have seen extensive use in theatre. There are several types used for special effects. The variety typically used for special effects is called sharkstooth scrim. However, in theater a scrim can refer to any such thin screen, and is made out of a wide variety of materials. Sharkstooth scrim is woven and earns its name because the weave resembles a set of triangles that resemble a shark's teeth with openings similar in size to a window screen's.

The most common effects that scrim is used for is the 'reveal effect', in which an actor or scene is made to appear or disappear by using the scrim and appropriate lighting. Other common effects include sharp silhouettes, backlit from behind the scrim, or other shadow effects (shrinking and growing a shadow).1

The bobbinet/bobbinette is a type of scrim that has a hexagonal hole shape and comes in a variety of hole sizes. It is used for a number of lighting effects in the film and theatre industries. …

A scrim was an integral part of the Beijing Olympic Stadium in Beijing. It was the screen running around the top of the stadium during the opening ceremonies on which all kinds of scenes were projected. Li Ning ran around it just before the cauldron lighting for 2008 Summer Olympics. …

Scrims both reflect and transmit light. This means that if a light from a front-of-house position is shone at a scrim, then both the scrim and everything behind it will be lit. This can lead to a variety of interesting effects:

A scrim will appear entirely opaque if everything behind it is unlit and the scrim itself is grazed by light from the sides or from above. A scrim will appear nearly transparent if a scene behind it is lit, but there is no light on the scrim. A dreamy or foggy look can be achieved by lighting a scene entirely behind a scrim. If a light with a gobo is aimed at a scrim, the image will appear on the scrim, but also any objects behind the scrim will be lit by the pattern as well.1 In general, anything that is lit will be seen on both sides of a scrim: scrims do not absorb light. Scrim can also be used in theatre in combination with a cyclorama or backdrop. The idea is similar to the other uses. When the drop is lit (or images or video are rear-projected onto the back of the drop), the images or colours projected are visible. However, when the drop is not lit, the images or colors will disappear. A scrim can also help dull the image, creating a greater sense of depth.

Another effect is caused by layering two scrims, or even by placing a mirror behind a scrim and lighting it: the familiar moire effect. This can often cause audience disorientation.

Theatrecrafts.com notes the following US/UK English difference:

A Gauze (UK) or Scrim (USA) is a coarsely woven cloth which can appear transparent or solid depending on how it’s lit. The words ‘Scrim’ and ‘Gauze’ are used interchangeably.

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  • With all due respect, might your answer shorten to one key sentence "The most common ... is the 'reveal effect', in which an actor or scene is made to appear or disappear by using the scrim and appropriate lighting. Other common effects include sharp silhouettes ... or other shadow effects." Commented Aug 20, 2023 at 1:31
  • I beg to differ😌That sentence appears to refer to the effects a scrim/gauze can be used to create.
    – bookmanu
    Commented Aug 20, 2023 at 1:47
  • I see. Thankyou to everyone for the response. Is this kind of play typically a cultural thing in China or a form of theatrical play Commented Aug 20, 2023 at 6:32
  • Also, I looked it up and found a term called shadow play but that one involves puppets. One that involves human actors behind the scrim would be called what though? en.m.wikipedia.org/wiki/Shadow_play Commented Aug 20, 2023 at 6:42

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