Harry led the group to a gate in the stone wall. It opened onto a neat flagstone path that meandered toward the lake. "Don't thank me, either of you. I only brought the both of you along so that you could ask all the smart questions and make sense of what they show us."

        Slughorn laughed indulgently, but Neville only smiled. James figured that his dad was probably telling at least part of the truth, and only Neville knew it.

        The group approached a large canvas tent that was pitched on a low rise overlooking the water. An American flag hung limp on one of the tent's poles, over a flag emblazoned with the Alma Aleron crest. A pair of American students stood talking nearby. One of the students saw the group and acknowledged them with a slight nod. He called toward the tent. "Professor Franklyn?"

        After a moment, Franklyn emerged from the side of the tent, wiping his hands on a large cloth. "Ah! Greetings, visitors," he said graciously. "Thank you so much for coming."

        Harry shook Franklyn's outstretched hand. It was apparent that they had already met earlier and arranged this gathering. Harry turned and made introductions all around, finishing with James.

        "Of course, of course," Franklyn said, beaming at James. "Young Mr. Potter is in my class. How are you today, James?"

        "Good, sir," James answered, smiling.

        "As you should be, on such a fine day," Franklyn said seriously, nodding approvingly. "And now that the pleasantries have been seen to, do follow me, my friends. Harry, you were interested in seeing the means by which we care for our vehicles, is that right?"

        "Very much so," Harry said. "I wasn't here to see your arrival, of course, but I heard all about your interesting flying vehicles. I am very eager to see them, as well as your storage facility. I have heard quite a lot of speculation about it, although I admit I understand very little of it."

        "Our Trans-Dimensional Garage, yes. Virtually none of us understands very much about it, I am afraid," Franklyn said dubiously. "In fact, if it were not for our technomancy expert, Theodore Jackson, none of us would have the slightest idea how to maintain it. Speaking of whom, he sends his apologies for not being able to be here for the tour. He will be joining us this evening and will be happy to discuss it with you then, should you have any questions for him."

        "As I'm sure we will," Titus Hardcastle said in his low, gravelly voice.

        James followed his dad around to the open side of the tent and nearly tripped over his own feet when he looked inside. The tent was quite large, with complicated wooden struts and frameworks supporting it. All three of the Alma Aleron flying vehicles were parked inside it, leaving enough room for neat arrangements of tool chests, maintenance equipment, extra parts, and several men in work clothes who moved among the vehicles busily. The strangest thing about the tent, however, was that the back was missing. Where James was sure he should have seen the hanging canvas wall he had seen from the outside, there was simply open air, looking out onto a view that was definitely not any view of the Hogwarts grounds. Neat, red brick buildings and huge, horny trees could be seen in the distance beyond the tent's missing back wall. Even stranger, the lighting of the scene was completely different than the bright noon sunlight of the Hogwarts grounds. On the other side of the tent, the scene was lit with a pale pink light, the huge, fluffy clouds in the distance tinged with gold. The trees and grass seemed to sparkle, as if covered in morning dew. One of the workmen nodded at Franklyn, then turned and walked out into the strange scene, brushing his hands on his overalls.

        "Welcome to one of the worlds few trans-dimensional structures," Franklyn said, gesturing proudly. "Our Garage, which simultaneously stands both here, in temporary residence on the grounds of Hogwarts castle, and in its permanent location in the east quadrangle of Alma Aleron University, Philadelphia, Pennsylvania, United States."

        "Great Ghost of Golgamethe," Slughorn said, stepping forward slowly. "I've read of such things, but never thought I'd live to see one. Is this a naturally occurring temporal anomaly? Or is this orchestrated via Quantum Transference Charms?"

        "That's why I invited you, Professor," Harry said, smiling and examining the interior of the tent.

        "The former," Franklyn said, stepping between the Dodge Hornet and the Volkswagen Beetle to make room for the group. "This is one of only three known dimensional plurality bubbles. What that means, I am told, is that this tent exists within a dimensional bridge, allowing it to span two places simultaneously. Thus, we can see on one side the noontime grounds of Hogwarts," he gestured out the open side of the tent through which they had entered, "what you might think of as our side of the transdimensional bubble. And on the other side," he spread a hand toward the dim landscape seen magically through the rear of the tent, "the dawn-time quadrangle of Alma Aleron University, the other side of the bubble. Meet Mr. Peter Graham, our head mechanic."

        A man straightened up from the open hood of the Stutz Dragonfly. He smiled and waved. "Good to meet you lady and gentlemen. So to speak."

        "Likewise," Neville, who was closest, said a bit faintly.

"Mr. Graham and his men are all in the American half of the bubble," Franklyn explained. "Seeing as they are specifically trained to work on our fleet, we find it best to let them handle the care and maintenance even while we travel. As you may guess, however, they are not, technically, here." To illustrate, Franklyn reached toward one of the workmen who was squatted near the Hornet. Franklyn's hand swept through the man as if he were smoke. The man seemed not to have noticed.

        "So," Harry said, frowning slightly, "they can hear us, and see us, and we can see and hear them as well, but they are still there, in America, and we are still here, at Hogwarts. Therefore, we cannot touch them?"

        "Precisely," Franklyn said.

        James spoke up. "Then how is it we can touch the cars and so can your mechanics in the States?"

        "Excellent question, my boy," Slughorn said, patting James on the back.

        "It is indeed," Franklyn agreed. "And that is where things get a bit, er, quantum. The simple answer is that these cars, unlike us, are multi-dimensional. You've all heard, I expect, the theory that there are more dimensions beyond the four we are familiar with, yes?"

        There were nods. James hadn't heard of any such theory, but he thought he understood the idea nonetheless.