Casey the Joint

Here's a (very) short story. I'm not even sure if it's long enough to be considered a short story. 

Casey looked up from the text book, tapping her pen against the desk top. The small print from the book still drifted over her eyes. She couldn't concentrate, and she wasn't sure why. That morning she hadn't felt any different than usual. Just a little too tiered, as always.

Casey sighed, shoving the note and text books back into her messenger bag. With a yawn she stood back up, pushing the chair back into place with her foot. She drifted through the library, holding a cell phone at her hips and looking down at it. She drifted through the library like any other ghost. She might as well have not been there. But that is the way libraries are supposed to be.

The air was crisp when Casey walked through the pneumatic doors. She pulled her university sweat shirt around her more tightly as she walked across the campus. She paused while in front of a class room window. The class appeared to be in session, even though there were only a few students. Not more than four.

Or maybe seven, Casey thought, no three.

Casey shook her head and glanced back at the teacher. She stared at him for the longest time, wondering why he seemed off. With a shock she realized the teacher's hair color had changed.

Casey ducked behind a tree when one of the students looked at her. She continued to study the class room from behind the tree. Every time her eyes flickered over the scene it changed in a slight and nearly indiscernible way. Yet over the course of several glances, it was obviously the interior of the class room had changed.

Before long, the class room appeared to be let out. Casey shuffled out from behind her tree and entered the building the classroom was in. She reached the door she was fairly certain opened up to the class room. She peered in and saw the teacher tidying up.

"Need something?" the teacher asked, his dark brown eyes jabbing at Casey.

Casey side stepped in front of the door way. "Um yes, well, I was wondering what you were teaching today."

"What I was teaching?" the teacher said, coly walking up to Casey. "Why would you want to know that?"

Casey unknowingly wrung her hands. "It looked interesting."

The teacher's smile uncurled over his face. The eyes glittered a mischievous hazel. "Phase transition."

The teacher slammed the door in Casey's face.