Humans, like all physical objects in our everyday experience, are commonly considered to be three-dimensional (3D) entities. We exist in and perceive the world in three spatial dimensions: length, width, and height.
However, from a scientific perspective, one can argue that humans are four-dimensional (4D) entities if we take into account the dimension of time. This perspective treats time as an additional dimension, forming a four-dimensional spacetime framework.
In the framework of spacetime, an event such as the presence of a human at a specific location and time is represented by a four-dimensional coordinate. This viewpoint is commonly used in the theory of relativity, which unifies space and time into a four-dimensional continuum.
In this context, humans can be considered 4D objects because our existence spans across both space and time. Our experiences, actions, and interactions occur at specific points in both the three spatial dimensions and the dimension of time. However, it's important to note that when discussing the dimensions of humans, the term "3D" generally refers to the spatial dimensions, while "4D" includes time as well.
So, whether humans are described as 3D or 4D depends on the context and the specific framework of discussion. In everyday language and perception, we typically refer to humans as three-dimensional beings, but from a scientific standpoint, considering the spacetime framework, humans can be seen as four-dimensional entities.