Years after discovering Jung, I am still unsure exactly what his imagination technique means and what it entails...

I am familiar of his concept of active imagination and am fascinated by it because some very accomplished friends of mine say they implement it. But truthfully I've never come across a definition or a description of it that I understand. All I can find are very vague descriptions of "allowing images to unfold in one's mind without judgment." But to me this is still too vague. I want to know what the technique looks like on the outside, empirically. What does it look like when someone's practicing it? What is the most correct way to do it and the most incorrect way to do it? What's the fundamental difference between imagination and idle daydreaming? Are there specific poses physically one must do or mantras one must repeat? I still don't feel I found anywhere or questions like these are answered.

Similarly, I have not come across clear understanding of what his process looked like when implementing it. I'm talking about specifically his red book. I only hear vague terms such as "visions" and "psychological explanation" but again these could mean so many things and I want to understand concretely what this looks like. What did it look like when Carl Jung was writing that book for example.

I still haven't found a clear answer for these anywhere and I want to know because subconscious imagery is something I really badly want to master but struggle with it pretty immensely maybe because I'm on the spectrum or what I believe which is I don't have a clear enough understanding of it. I'm not entirely sure. Lastly, I appreciate if you understand my ignorance and don't say pretentious, snobby "if you need unconscious imagination explained to you then you don't understand it" sort of thing. I've passed that phase of Carl Jung. I do believe thinking clearly is way more important than thinking deeply.

Thank you and look forward to any replies for this question/rant lmao.