In the end, Douglas glanced at the time and said, "It's getting late. Let's head out as soon as possible."
He then led them onto the altar in the middle of the room.
Once he stepped onto the altar, Harry wore a strange expression. The entire altar was made of a kind of stone he didn't recognize, covered in all sorts of strange runes. All of that was still within Harry's understanding; wizards had made it, after all.
But a console in the middle of the altar held a screen that seemed to have been made from a sheet of glass, with numbers displayed on it. That left Harry completely stunned.
He had seen things like this in science-fiction films on television back when he lived with the Dursley family. Was science fiction at the heart of magic?
Shocked, he looked over to see the others' reactions, only to hear Lupin ask in puzzlement, "This isn't Muggle technology, is it? But as far as I remember, their display technology can't do anything like this."
Sirius said smugly from beside him, "Now, this is something you don't know about. It's called a transparent touchscreen display. Of course Muggles don't have this technology yet, but it was indeed made by taking inspiration from Muggle screen technology and combining it with magic. You can operate it directly on this sheet of glass."
Harry asked curiously from beside them, "So what is this thing? Weren't we going out? Why have we come here?"
Sirius eagerly jumped in to explain. "This is a One-Way Directional Teleportation Array. It can transport you to any corner of the United Kingdom, whether up in the sky or underground. All we have to do is enter the three-dimensional coordinates devised by Muggles on this screen-latitude, longitude, and elevation-and it