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 .
=== The 4th Dimension -- from Carl Sagans Cosmos: A Personal Voyage.
The 4d cube/tesseract rotation, perspective projection, unwrapping from 4d to 3d and wrapping back to 4d. This is a projection of tesseract into 3D space.
Attempting to view a 4th dimensional object with our 3rd dimensional eyes.