"So, what is a tesseract in A Wrinkle in Time, and how does it make interstellar space travel such a cinch? Before delving into tesseracts, we have to understand how Madeline L'Engle sets up dimensions in A Wrinkle in Time. In the book, Meg's brother Charles Wallace explains that the first dimension is a line. The second dimension is a square. The third dimension is a cube. The fourth dimension is time. And that brings us to the fifth dimension — tesseract."
https://www.thewrap.com/wrinkle-time-tesseract-sound-familiar/
'A Wrinkle in Time': What Is a Tesseract, and Why Does It Sound Familiar? - TheWrap
Here's what you need to know about the weird space-folding ideas of "A Wrinkle in Time," how they work, and where you've heard "tesseract" before
https://www.thewrap.com/wrinkle-time-tesseract-sound-familiar/
"Humanity needed to surrender its freedom willingly"... More true than ever.
https://www.youtube.com/watch?v=BDzoHT0E8SE