The so-called ultimate time refers to a super-existence that transcends all dimensional worlds, has no beginning and no end, and is the highest existence in concept. Ordinary time refers to the plane time that guides and controls the operation of each plane, and the legendary space-time dragon controls this type of time.

Ordinary time is divided into the time of each plane due to the difference in planes, and is named after the plane name. For example, the Colin plane where Ciri is located has its own Colin plane time, while the elemental plane where the magic core is produced follows the elemental plane time, and the flow rate of each plane's time is not the same relative to the ultimate time.

When intelligent beings are able to control and even travel through time, there is a very famous paradox --- the grandmother's paradox.

If a person really "goes back in time" and kills his own grandmother before his maternal grandmother conceives his mother, then can the intertime traveler himself still exist? The question is obvious, without his maternal grandmother there would be no his mother, without his mother there would be no him, without him, how could he "go back in time" and kill his own maternal grandmother before his maternal grandmother conceived his mother. This is the "grandmother paradox".

And the summoner's interpretation of this paradox is that the past and the future are equally uncertain existences, and only the present is certain and unchanging. In this theory, time is seen as a vast web that is constantly intersecting. If we extract a little bit of the present, then there are not only countless possible timelines in the future, but also countless possible timelines representing the past.

What you do and even different external factors can create a myriad of futures, and similarly, there are countless possibilities that can make you who you are now.

When you kill your grandmother, the other timelines that connect to the present will take the place of this line to make you exactly the same you, and the difference between this line and the original past timeline may be just an extra grass growing in the world that you will never touch, and the current you have not changed at all. (Okay, I'm a bit confused about time, but it's a conjecture I envision for the "grandmother's paradox" in addition to the mainstream parallel universe theory and the "post-selection model" model of time travel.) You don't need to understand this conjecture that I hypothesized for a while, you just need to know the conclusion that there are countless changes in the future and the past, and that the present extracted alone is certain, and that there will be countless changes when the present becomes the past. This causes you to change the past and not change the present, but you can have an impact on the future by changing the past. ）

When you understand the structure of time more and more thoroughly, it is possible to perceive the existence of the mirror image of time, and only then can you summon it.

Of course, Ciri needs to understand more than just these superficial contents, he needs to learn more about the theory of time, and constantly improve it in the process of learning, so that it is possible to use it to find the "hiding place" of the time mirror.

As the rest of the semester dwindled, Ciri's course was completed and the practical teaching began. Although the toys that the students want to make are varied, the adaptability of the [Logic Module] is very strong, and Xi Rui only needs to make a slight change to the unreasonable places in the carrier of some [Logic Module], and the students can successfully complete their own production.

After two classes of hands-on instruction, some of the freshmen had already made toys, and all sorts of strange creatures began to appear running around the classroom. However, since the makers are all novices, there are inevitably some problems with the work sometimes. Most of the problems are caused by the incorrect carving of the runes or magic formations of the [Logic Module], but the toys created in this way are more funny, some obviously have four legs but only use one leg to jump and move, some [Dodge Module] failed to engrave and only keep hitting the wall, and some [Feedback Module] will scream if the toy is not ready. But these are minor issues, and Ciri can help them solve them by probing them.

The auditors didn't come to the last few practical classes, because Xi Rui no longer talked about new content, and although they haven't figured out the specific principles of these simple [logic modules], there is no problem with carving them, so there is no need to participate in the practical operation guidance courses later. What they need to do now is to find a quiet environment and concentrate on trying to analyze and understand these [logic modules], even if they can't grasp all of them, it is good to understand only a part of the content. What's more, Xi Rui has already proposed the concept of "rune group" in class and rejected the example of connecting rune groups, I believe that they will use this aspect as a starting point and use a lot of experimental research to definitely achieve something.

After the last period of teaching, the remaining freshmen who had been studying for the elective class finally completed their works and played happily one by one, after all, these toys were not bought, but made by themselves. In fact, when they mature, they will know that the [Logic Module] given to them by Xi Rui is the real wealth.

The elective course is finally over, and the production of [Numer Profiler Type II] is almost complete. The study of space-time summoning is a long-term and arduous task, and there is no rush at all. Xi Rui's most important job now is to prepare for the promotion of the substitute teaching title.

The promotion of substitute teaching titles in Fanhua College is subject to public assessment. The college will send some teachers and several research teachers with the title of teaching assistant to listen to the report of the experimental results and the display of the finished product who want to be promoted to internship substitute teaching in public, and then score according to specific rules, and finally count the evaluation of all the raters to determine whether the promotion is successful. In this way, the purpose of the audit can be achieved, and some black-box operations can be prevented to a certain extent. Of course, the percentage of grading is different between the instructor and the teaching assistant who are graders. Of course, the teaching assistant has more power to speak than the teaching assistant, so sometimes the promotion has a lot to do with the preferences of the teaching assistant in charge of grading.

The time of the substitute promotion assessment is before the internship substitute assessment, and the disclosure is only for the academic mages within the prosperous academy, and it is not completely public, after all, what is to be reviewed is the research results of others, and it is not suitable to be too public.

As long as he passes the promotion assessment, Xirui's internship substitute teaching title can be promoted to substitute teaching, and the benefits will be greatly improved. In addition, for some outstanding works in the review process, the school will also sign a contract to be responsible for the cooperative production and promotion of research results. With the terrifying strength of the Flower Academy, every product it recognizes and recommends has been a great success.