Mirrors are a form of hazard found throughout the dormitories of Edgewood. Periodically a green flame appears inside them. Shortly after, they fire three small green fireballs in a cone shaped pattern fired straight down. Touching a mirror, even an activated one, won't do any damage. Often times there will be multiple mirrors in a room. There is even a form of challenge room that uses the mirrors. The mirrors can be destroyed with furniture-breaking attacks, just like any normal prop.
Sometimes various mirrors will glitch and fire only one fireball or even not fire at all (one-time only, may happen in different places, possible than that was intended).