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Why is squid a four-dimensional creature? Does four-dimensional space really exist?
People think that squid is a four-dimensional animal because squid can see places that we can't see, and they can expand their horizons beyond the length, width and height. It is said that there is a special crystal protein in the eyes of squid. This mysterious substance can help squid correct the images in their eyes and analyze them very blurry.

Scientists have done a lot of research on whether four-dimensional space exists or not. Hawking's works contain theories involving four-dimensional space. In his view, four-dimensional space, even if it exists, is extremely unstable, and it is not limited by length, width and height like our three-dimensional space.

For four-dimensional creatures who can see through time, perhaps in their eyes, each of us is a timeline, one is birth and the other is death, and they can see through the life we have lived hard at a glance.

Extended data

Four-dimensional space is different from three-dimensional space. Four-dimensional space refers to the standard Euclidean space, which can be extended to n dimensions. Four-dimensional space-time refers to a misunderstanding of Minkowski's concept of space. As a three-dimensional object, human beings can understand four-dimensional space-time (three spatial dimensions and one time dimension) but can't recognize and exist in four-dimensional space, because human beings belong to the third spatial dimension.

Generally speaking, time is the fourth dimension, that is, the time dimension in four-dimensional space-time The fourth dimension of four-dimensional space refers to the spatial dimension with the same nature as x, y and z. However, four-dimensional space-time is not a standard Euclidean space, and the essence of time is to describe the speed of motion.

Through the evolution of one-dimensional, two-dimensional and three-dimensional space, people put forward some conjectures about four-dimensional space. Although these conjectures cannot be proved to be correct now, many scientific theories begin with conjectures.

reference data

Four-dimensional space _ Baidu Encyclopedia