What is the most likely reason why the description of the props mentions that the should light up when the character Mirror speaks? to let the character Mirror's face appear in the mirror more clearly to let the audience know that someone is trying to send a signal to help the audience see the action on the stage better to show the audience that the voice they hear is Mirror speaking

The description of the props lighting up when the character Mirror speaks is likely intended to create a visual cue for the audience, signaling that the voice they hear belongs to Mirror. This clever use of lighting not only enhances the storytelling but also reinforces the magical or mystical essence of the character, making it clear who is “speaking” even without visual confirmation. Additionally, lighting up the props adds an engaging element to the performance, capturing the audience's attention and drawing them into the world of the play. It enhances the atmosphere and can evoke emotions, making the experience more immersive as the audience visually connects the voice with the enchanting glow of the mirror.