In addition to the second and third dimensions, there is another dimension. These three are the main concepts of dimension space.

One dimension is actually a straight line. Linear space.

The world we live in is a three-dimensional space. It has been suggested that the real world may be not only three-dimensional (three-dimensional), but also four-dimensional (four-dimensional) or even multidimensional (multidimensional). If it is four-dimensional, then time can be added, which can explain some events traveling in time.

In real life, people can change the shape and volume of an object by physical means, which is equivalent to changing any number of coordinates in a three-dimensional space. But the four-dimensional space formed by adding a timeline is different. If the time axis coordinates are changed, the three-dimensional coordinates of the object itself will change correspondingly in theory, so that the object does not exist at the current time, that is, it has entered what people call different dimensions.

However, this idea is still in the imagination stage, and no one can confirm it. According to this idea, mathematicians have built a multidimensional space model and studied it theoretically. This may be the dimension you mentioned in the dimension tunnel. In another dimension, people can not only change their position in space, but also change their position in time. In other words, people can go to any age they want according to their own wishes.

A Brief History of Time demonstrates that there will be no life in the space below two dimensions, while studies in other places have confirmed that atoms above four dimensions (including four dimensions) are unstable.

At present, these are just guesses. It is difficult for the human brain to directly imagine a space higher than three dimensions. Most people engaged in this research study according to the method of establishing coordinate system.

Second element is already an anime term.

The so-called "dimension" in Japanese ACG works usually refers to the fantasy world and the collection of its various elements.

For example, a world in which rules and order are completely different from the reader's existing world, such as magic or as high as existence, is usually called an "otherworldly world" or simply an "otherworldly world". In addition, traditionally, virtual characters represented by print media, such as characters in cartoons or animations, are often called "two-dimensional characters" because of their two-dimensional nature, so as to distinguish them from real (three-dimensional) characters. The characters made by three-dimensional computer images are called "2.5-dimensional characters" because they are in the virtual world and have three-dimensional concepts. Three-dimensional dolls and other things, from the initial definition, should be three-dimensional roles; But it is sometimes called "2.5-dimensional character" because it is usually a three-dimensional character based on two dimensions or emphasizes its virtuality. Based on the above etymology, people who are only interested in the virtual role of ACG and not interested in the real opposite sex are dubbed "the master of the second world", and in serious cases, they are dubbed "the second taboo syndrome"

To put it simply, the second element is an anime character, the third element is a human being in our world, and the second element is cosplay (imitating the second element).

The second element is an idealistic world full of fantasy, and it is also the spiritual pillar of people who like the second element.

The word "secondary element" can be used to refer to both the world itself in ACG works and the specific people and things in the ACG world.

And Sanyuan has nothing to say. It refers to the real world in which we live. Right next to us. Everything around us is in the third dimension. This is real life.

Another concept is four dimensions. In ACG's world, the word "four dimensions" refers to some incredible phenomena from a spatial perspective. In addition, Koreans call it four yuan. Korean programs generally use four dimensions to describe people who think differently from ordinary people. These people's jumping behavior is very strong, sometimes confusing, but sometimes they have unique logic.