the most important room

Exploration Stage: Capuchin Movie Theater
From: Carlos Light
Description: I believe that it is not an unusual device used in this hall, but an invention of the Five Wise Guardians. Why didn't I immediately think of the story about that legendary projector? It is located in the projection room, which has an elaborate lock on it. Let's find the key.
Completed: This is the key to a true filmmaker. You see, there is a light-sensitive section that resembles film. To open the projection chamber, the key must be placed in the keyhole and then the correct amount of light must be shone here.