I think that darkness. Or lightness. That's symbolism. The dark is evil, hate, and everything wrong in the world. The light is love, kindness and everything good in the world.
The audience at the first Royal Nonesuch performance didn’t retaliate against the duke and Dauphin because they are embarrassed about being ripped off and do not want others to know. This can be found in Chapter 23 of The Adventures of Huckleberry Finn by Mark Twain, when the duke and the dauphin end their show after only a brief performance.