Visualizing how a human would appear from a hypothetical four-dimensional perspective is a challenging concept, as our everyday experience and perception are limited to three spatial dimensions. However, we can try to provide a conceptual understanding based on mathematical analogies.
In a similar way that a three-dimensional object, such as a sphere, can cast a two-dimensional shadow on a flat surface, a four-dimensional object or a human observed from a four-dimensional perspective would potentially cast a three-dimensional "shadow" in our three-dimensional world. This analogy helps us grasp the idea that a four-dimensional being might manifest in our world in ways that are beyond our usual comprehension.
From a four-dimensional perspective, a human might be perceived as a continuously changing three-dimensional shape over time. Just as we observe an object in three-dimensional space from different angles, a four-dimensional observer might perceive different "slices" or cross-sections of the human at various points in time.
One way to visualize this concept is through an analogy called "hyperslicing." Imagine a static three-dimensional object, such as a sculpture, passing through a two-dimensional plane. From the perspective of the two-dimensional beings in that plane, they would perceive different cross-sectional slices of the sculpture as it moves through their plane. Similarly, a four-dimensional observer might perceive different "slices" or cross-sections of a human as they move through time.
It's important to note that these are speculative interpretations based on analogies and imagination, as our understanding of higher-dimensional perspectives is limited. The true nature of how a four-dimensional being would perceive or manifest in our three-dimensional world remains largely hypothetical and speculative.