And suddenly, it was over. He was still floating, but he felt something tickling his face. He opened his eyes to see Saya pinching his nose. When he waved his hand to shoo her away, she flew away, laughing.
But then Sherman blinked several times and screeched. Leah and the Geezer were standing there, but something was wrong. Horribly, utterly wrong. Leah’s normally dark-red hair was an odd teal color, and her skin was dark, freckles pale.
“MY EYEBALLS ARE TURNED INSIDE OUT!” he shrieked, closing his eyes against the negative image.
The Geezer grinned at him.
“You have a negative view on the world, apparently.”
Rowan appeared out of nowhere, eyes closed as if he were asleep. Saya flew through the air as if it were water and poked Rowan on the face, just as she had done Sherman.
“But- but-“ blubbered Sherman, staring around. “What’s going on?”
The Geezer shrugged.
“Where you just were- that sort of flying place- is actually just part of the Sibelnu magic creating an anti-self.”
“Please explain,” said Rowan, examining their surroundings- they were standing in a large room. Around them were shallow steps leading upwards, and to him everything had a soft golden glow.
“This place,” said the Geezer primly, “is called Reflection. When you passed through the mirror you were creating an anti-matter form of yourself that exists outside of the timestream, which is where we are now. The thing about your anti-matter selves is that you see the world as your mind sees it.”
“Huh?” asked Sherman, looking slightly sick.
“It means you have a negative outlook on the world if you’re seeing it in negative,” interpreted Leah.
“Really?” Rowan craned his neck around to get a good look at Sherman. “You see in negative? Awesome!”
“I don’t care!” answered Sherman, glaring around. “How do I see normally again?!” The Geezer smirked at this.
“Change your viewpoint,” he said simply, and began to walk up the stairs. “Come on, you lot, we still have to start the time-stopping process.”
The stairs did not take long to scale and Leah openly gaped at the high-ceilinged room around them. To her, everything had odd colors; the stones were a pale, mossy green, the bookcases that were scattered here and there were a haze of dark orange and pink, the assorted instruments on different tables were vibrant yellow and her blue jeans – quite blue in the normal world- were a brilliant green.
High windows glittered across the stone walls, letting in light from an unknown source. Rowan dashed over to one and looked out. As far as he could see, there were shifting sands. The stone room was floating above the sand dunes, and smaller islands floated somewhat below it.
“Whoa,” he muttered, taking in the glow of the sand and islands.
“How does one stop time?” asked Leah, staring apprehensively at a shelf that was crammed with nasty-looking bottles.
“What does the sun burn?” asked the Geezer in reply as he stumped over to a large hourglass that was situated in a small dip in the stones. Leah didn’t answer, but followed him. “The sun burns Time, of course.”
“So to stop time, you have to stop the sun from burning Time?” puzzled Leah.
The apparatus in front of her confused her even more. It was shaped like an hourglass, but no sand moved within its depths. Instead a blooming tree blossomed from the top, its roots tangled through the small hole. On the bottom side a dead tree sat, its empty branches waving softly in an unseen wind. It was connected by a piece of gold machinery to another hourglass. Sand ran through it, falling from an unseen source, and fell into nothingness.
“Hey, you idiots! Get over here!” shouted the Geezer at Rowan and Sherman. Sherman had been examining a bell-shaped piece of glass and Rowan had almost fallen out of the window to get a good look at one of the islands.
________________
~Sumi
Very clever, as well as the idea of "The Reflection." 
Now onto the in-depth crit:
If you are trying to get a point across to the reader, narrate it. Like this:
There's more, isn't there?? OMG. I didn't see "#12" at all. It just...missed me. I was trying to go through the whole list of people who just posted stories (on the homepage), so I really wasn't paying attention to titles!!
