The Door

by Equimorto


S

Twilight was becoming frustrated by the door.
It hadn't showed up in the library for a while, outside of when she was walking away, too far from the mirrors. But then, once she'd removed her experiment, it had started to appear there again.
It almost felt like it was mocking her. Appearing at the corner of her eye, right as she was passing by a corridor, only for it to not be there when she looked back. Sometimes it flashed in her vision while looking up from a book or from her meal. Once she even saw it in her mirror, only to turn around to nothing.
This went on for quite a while. The door dodged any chance of her studying it, and came back to her when she was too busy for it. She looked one way while searching for something, and there it was, only to be gone a moment later. It was impossible to do anything about it, and at that point she was almost becoming accustomed to it.