These are objects rendered in two dimensions, the only fourth-dimensional thing about them is that they are animated.
The first dimension (length) is an infinite series of infinitesimal zero-dimensional universes (points) - such as a number-line in mathematics.
The second dimension (width) is an infinite series of one-dimensional universes (lines) - such as an image on a computer screen.
The third dimension (depth) is an infinite series of two-dimensional universes (planes) - such as a still object in our universe.
The fourth dimension (time/duration) is an infinite series of three-dimensional universes - this is our timeline, from the theoretical origin of the universe until its termination.
...The fifth dimension (potentiality) is an infinite series of four-dimensional universes (timelines).
We can move relatively freely in the first three dimensions; our movement is more or less fixed in the fourth (we can slightly change that by adjusting our position and velocity relative to a large mass such as a planet). In the fifth dimension, one might argue that we are stationary, despite having the appearance of free will - this is a variation on the concept of predestination. Alternately, we could say that we move constantly in the fifth dimension, deciding which fifth-dimensional "timeline" to follow, though we can't actually see our position or any other potential fifth-dimensional lines; we do not even have an "echo" to go by, as we do in the case our memory - an alleged remnant from one of two possible directions in the fourth dimension. We can't ever see with certainty how things would have played out, had we chosen X instead of Y.
So yes, these are four-dimensional... but only in one of two ways: either in the way everything ELSE our eyes fall upon is four-dimensional, or in the sense of a computer variable array. Everything exists in all dimensions at once, anything else would betray the definition of "dimension."
