Understanding 4D -- The Tesseract

So this has boggled my mind for a while: How, exactly, do you rotate in 4 dimensions? Well, this video *should* answer that. Hopefully. As always, if you have any questions, comments, or concerns, let me know in the comment section below!

The music came from Josh Woodward (sped up 1.5 times):

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[Benjy]

I played myself thinking I was smart enough to watch this video

[JackTheChappers]

When trying to find the longer side of the blanket

[Dein_Lieblingsknochen]

"the obvious answer is to take a 3x4 matrix and multiply by that"
ah yes, just what i was thinking

[niccosalonga]

I've been trying to "picture" tesseracts in my head and other four dimensional shapes and I feel seriously unwell.

[deadender]

you show me a 4D object in 3D world on my 2D screen and I try to understand this with my 1D brain

[abrahamling]

Me : okay brain, so what you got?
My last active brain cells : Cube is a box

[MrFillyWonka]

I think i remember seeing something that may help visualize the 4th dimension.

Let us imagine a drawing of a stick figure holding a box, and a stick figure behind them.
We in the 3rd dimension who look into this image can see everything. The contents of the box, and the stick figure behind them.

The stick figures can only see in the 1st dimension, so the stick figure can only see lines and any lines stop their field of view. Hence why they cannot see through the box as they only exist in the X and Y axis.
If a person in the 3rd dimension were to try to interact with the second dimension, like trying to stick their hand through a page, the stick figure would only see first your finger tips, then the rest of your hand coming through, and they wouldnt understand the sequence of what this ever changing thing, one line at a time. When it is really a hand.

Let us then picture the same scenario, where we are holding a box and someone is behind us.
We cant see whats in the box, and we cant see the person behind us.

A being in the 4th dimension can see whats in the box, the person behind us, and everything else going on around us.

It trying to interact with us in the 3rd dimension would be something similar to us sticking our hand in a stick figure's line of sight. It would come seemingly out of nowhere from some other spatial reality or rift and we wouldn't understand what is really happening.

[BLUE-hxxs]

Played this to see how smart I am, and discovered that im just a simple person .

[AHEAD]

I understood the part when he said see you next time

[uzairansari]

Trying to explain the 4th dimension is like explaining colors to a person blind since birth. There's no way to actually visualize is correctly.

[watercat]

I wouldn’t even begin to comprehend this when I’m awake, let alone watching this at 2am...

[graywarden]

After watching the video (watching, not understanding), I can say that I absolutely love the guitar playing in the background.

[craigbeaulieu]

"So, there you have it..."

No I don't...

[NiquidFox]

I remember learning about this as a kid and I made it a point to try drawing a tesseract on all of my homework so that long into the future people would be perplexed as to why a kid was drawing 4d shapes 😂

[vencelfoldi]

I find it so fascinating that there are concepts, such as the concept of 4 or more dimensions or the concept of being dead, that completely short-circuit the human brain and we as a species are physically incapable of comprehending them.

[arshraza]

*Before watching
Me : I am confused

*After watching
Me : I am con and fused

[AS-mwpw]

2:46 ah yes, the obvious answer. I was just about to say that

[TonyPanama]

This was the best one thus far. Thank you for your time and perspective.

[vskkripalu]

One of the best explanations of 4D that I have heard. Thank You!!

[alindamabhena]

just when i thought i wasnt smart enough for this video i was comforted by the comments