Its line of sight has expanded to another direction other than the length, width and height, which is perpendicular to the length, width and height. However, it is difficult for any three-dimensional object to act on an object with four-dimensional consciousness.

Squid's eyes are much more powerful than humans. Humans and general animals can observe things better by changing the lens in the eyeball, but the disadvantage is that they can't focus on one point, so the generated images are blurred. But the squid is different. There is a very special crystal (S- crystallin) in the eye. The magic of this crystal is that it can correct blurred images, so it can adapt to the objects it sees by changing the eyeball. Therefore, the vision of squid is much more advanced than that of human beings.

Squid's line of sight extends to another direction other than the length, width and height, which is called δ by geometricians and perpendicular to the length, width and height. At this time, many scientists have to sigh that the IQ of the squid is relatively low. If it has the same wisdom as human beings, no three-dimensional object can hold it, because any closed three-dimensional object has no effect on a creature with four-dimensional consciousness. Although many people call squid a four-dimensional creature, human beings can only perceive the real existence of the three-dimensional world, so squid is still the product of the three-dimensional world in the final analysis, but it has only one dimension of the pseudo-four-dimensional world.

Four-dimensional creatures are simply creatures living in four-dimensional space-time. We are most familiar with three-dimensional space, because the earth is a three-dimensional space, and all creatures on the earth are three-dimensional creatures living in three-dimensional space. In this space, objects are three-dimensional, with length, width and height. Four-dimensional space is more powerful than three-dimensional space, because there is a visible timeline in this space. Simply put, creatures in this space can not only freely enter and leave three-dimensional space (our walls are useless to four-dimensional creatures), but also manipulate time and travel back and forth in the past and future. Three-dimensional creatures can't see the time axis, so from the level of dimensional space-time, creatures in low-dimensional space-time can only see a cross section of high-dimensional space-time.