I see. Yeah, obviously the world only has 3 spatial dimensions, so you can’t represent 4D data spatially.

My general point is that we have additional senses that we can use to represent additional dimensions. And that totally counts as “visualization”.

And it is not possible to “visualize 4D”

Sure it is.

• 3 spatial dimensions + time
• 3 spatial dimensions + 1 color dimension (grayscale)
• 2 spatial dimensions + 2 color dimensions
• etc

And that’s not even counting projection. All the time we interact with 3D data that’s projected to 2D (almost every photo you’ve ever looked at). There are similar ways to project 4D to 2D.

(Not defending the video or anything, just pointing out that visualizing higher dimensions is something we know about for ages.)