Four-dimensional

It's impossible for us to visualise four-dimensional objects.

This glistening little tulpa is a four-dimensional creature. The crown of his head is my biological mother squeezing me out, and the tips of his toes will be the death of me. We are about a quarter past his nipples at the moment. Tubular, man!

Four-dimensional space is confusing.

But some philosophical people have been asking why three dimensions particularly—why not another direction at right angles to the other three?—and have even tried to construct a Four-Dimensional geometry.

Block time is the entirety of time, including the past, present and future, coexisting in a four-dimensional spacetime block called a "block universe." If one inhabits a block universe, one's view of time as only ever moving forward steadily is merely an illusion, a physical artefact that is mathematical.

Imagine explaining to a circle on a piece of paper what depth is like. It is equally difficult for us to understand the concept of the four-dimensional world.

We live in a four-dimensional universe.