Mirrors are associated with magic through many myths, stories and legends.
It was believed that the reflection in the mirror (or any other reflective surface) was a vital part of one’s soul. (sound familiar??? What about a vampire’s reflection???)
Mirrors were thought of as “soul catchers.”
Draping black cloths over mirrors in the sick room of a dying person was to prevent the soul from being taken.
In witchcraft mirrors are used as divination tools, like a crystal ball. The witch sees images in the mirror and interprets them.