

For people confused by the mathematics of imaginary numbers, the symbol i is just a shorthand rotational operator.
If something changes and comes back to it’s original state as if it rotated and you want to represent it in an equation, you use i.
Calling i imaginary makes it more mysterious than it actually is. The real world is filled with rotation.
Yeah. Although at the quantum level spin isn’t something physical like a ball spinning. It’s an intrinsic property. That is an electron changes its properties over time exactly as if it was spinning even though it’s not physically spinning as we understand it for large objects.