"Well," said Casimir, sounding apologetic, "that's not what you want. Your room is not identified by room number, because some rooms repeat. It's identified by door number, which is unique for all doors. This number you were looking at isn't either of those, it's your room ID number, which has to do with data processing. That ID number refers to your actual door number, incorrectly called room number. It is the middle six digits of this character string here. See?" He masked the string of figures between the dirty backward parenthesis of his thumbnails. "In your case we have E12S, giving tower, floor and wing, and then 49, your actual room number."

Sarah did not know whether to scream, apologize or drop dead. She shoved her forms into her knapsack and stood. "Thank you for your trouble, Mrs. Santucci," she said quickly. "Thank you," she said to Casimir, then snapped around and headed for the door, though not fast enough to escape a withering harrrumph from Mrs. Santucci. But as she stepped into the hallway, which in order to hold down utility costs was dimly lit, she saw a dark and ragged figure out of the corner of her eye. She looked behind to see Bert Nix grab the doorframe and swing around until he was leaning into the office.

"Listen, Genevieve," he said, "she doesn't need any of your phlegm! She's President! She's my friend! You're just a doorstop!" As much as Sarah wanted to hear the rest of this, she didn't have the energy.

Casimir was left inside, his last view of Sarah interrupted by the dangling figure of the loony, caught in a crossfire he wanted no part of.

"I'll call the guards," said Mrs. Santucci, who for the first time was showing uneasiness.

"Today?" Bert Nix found this a merry idea. "You think you can get a guard today?"

"You'd better stop coming or we'll keep you from coming back."

His eyes widened in mock, crimson-rimmed awe, "Ooh," he sighed, "that were terrible. I'd have no reason to live." He pulled himself erect, walked in and climbed from the arm of Casimir's chair to the broad slate sill of the window. As Mrs. Santucci watched with more terror than seemed warranted, the derelict swung one window open like a door, letting in a gust of polluted steam.

By the time he was leaning far outside and grinning down the seventy-foot drop to the Parkway and the interchange. she had resolved to try diplomacy– though she motioned that Casimir should try to grab his legs. Casimir ignored this; it was obvious that the man was just trying to scare her. Casimir was from Chicago and found that these Easterners had no sense of humor.

"Now, Bert," said Mrs. Santucci, "don't give an old lady a hard time."

Bert Nix dropped back to the sill. "Hard time! What do you know about hard times?" He thrust his hand through a hole in his jacket, wiggling his long fingers at her, and wagging his out-of-control tongue for a few seconds. Finally he added, "Hard times make you strong."

"I've got work to do, Pert."

This seemed to remind him of something. He closed the window and cascaded to the floor. "So do I," he said, then turned to Casimir and whispered, "That's the Julian Didius III Memorial Window. That's what I call it, anyway. Like the view?"

"Yeah, it's nice," said Casimir, hoping that this would not become a conversation.

"Good," said the derelict, "so did J. D. It's the last view he ever saw. Couldn't handle the job. That's why I call it that." The giggling Bert Nix ambled back into the hail, satisfied, pausing only to steal the contents of the office wastebasket. Through most of this Casimir sat still and stared at the faded German ti 1 poster on the wall. Now he was really in the talons of Mrs. Santucci, who had probably shifted into adrenaline overdrive and was likely to fling her desk through the wall. Instead, she was perfectly calm and professional. Casimir disliked her for it.

"I'm a junior physics major and I transferred in from a community college in Illinois. I know the first two years of physics inside and out, but there's a problem. The rules here say physics courses must include 'socioeconomic contexts backgrounding,' which I guess means it has to explain how it fits in with today's something or other.

"In order to context the learning experience with the real world," said Mrs. Santucci gravely, "we must include socioeconomic backgrounding integral with the foregrounded material." "Right. Anyway, my problem is that I don't think I need it. I'm not here to give you my memoirs or anything, but my parents were immigrants, I came from a slum, got started in electronics, sort of made my own way, saw a lot of things, and so I don't think I really need this. It'd be a shame if I had to start all over, learning, uh, foregrounded material I already know."

Mrs. Santucci rolled her eyes so that the metal-flake blue eyeshadow on her lids flashed intermittently like fishing lures drawn through a murky sea. "Well, it has been done. It must be arranged with the curriculum chair of your department."

"Who is that for physics?"

"Distinguished Professor Sharon," she said. Bulging her eyeballs at Casimir, she made a respectful silence at the Professor's name, daring him to break it.

When Casimir returned to consciousness he was drifting down a hallway, still mumbling to himself in astonishment. He had an appointment to meet the Professor Sharon. He would have been ecstatic just to have sat in on one of the man's lectures!

Casimir Radon was an odd one, as American Megaversity students went. This was a good thing for him, as the Housing people simply couldn't match him up with a reasonable roommate; he was assigned a rare single. It was in D Tower, close to the sciences bloc where he would spend most of his time, on a floor of single rooms filled by the old, the weird and the asinine who simply could not live in pairs.

In order to find his room he would have to trace a mind-twisting path through the lower floors until he found the elevators of D Tower. So before he got himself lost, he went to the nearest flat surface, which was the top of a large covered wastebasket. From it he cleared away a few Dorito bags and a half-drained carton of FarmSun SweetFresh brand HomeLivin' Artificial Chocolate-Flavored Dairy Beverage and forced them into the overflowing maw below. He then removed his warped and sweat-soaked Plex map (the Plexus) from his pocket and unfolded it on the woodtoned Fiberglass surface.

As was noted at the base of the Plexus, it had been developed by the AM Advanced Graphics Workshop. Rather than presenting maps of each floor of the Plex, they had used an Integrated Projection to show the entire Plex as a network of brightly colored paths and intersections. The resulting tangle was so convoluted and yet so clean and spare as to be essentially without meaning. Casimir, however, could read it, because he was not like us. After applying his large intelligence to the problem for several minutes he was able to find the most efficient route, and following it with care, he quickly became lost.

The mistake was a natural one. The elevators, which were busy even in the dead of night, were today clogged with catatonic parents from New Jersey clutching beanbag chairs and giant stuffed animals. Fortunately (he thought), adjacent to each elevator was an entirely unused stairwell.

Casimir discovered shortly afterward that in the lower floors of the Plex all stairwell doors locked automatically from the outside. I discovered it myself at about the same time. Unlike Casimir I had been a the Plex for ten days, but I had spent them typing up notes for my classes, It is unwise to prepare two courses in ten days, and I knew it. I hadn't gotten to it until the last minute, for various reasons, and so I'd spent ten days sitting there in my bicycling shorts, drinking beer, typing, and sweating monumentally in the fetid Plex air. So my first exposure to the Plex and its people really came that afternoon, when I wandered out into the elevator lobby and punched the buttons. The desperate Tylenol-charged throngs in the elevators did not budge when the doors opened, because they couldn't. They stared at me as though I were Son of Godzilla, which I was used to, and I stared at them and tried to figure out how they got that way, and the doors clunked shut. I discovered the stairways, and once I got below the bottom of the tower and into the lower levels, I also found that I was locked in.