What I’ve grasped is that when we think some concrete object we create a thought form and what I see in the mind, not much clearly, perhaps is that thought form, but I’m not sure about it. The picture that we see in the mind is really the thought form we have created ?

When we think about abstract things, we create geometric thought form, but in that case
why don’t I see them ?
When I think in more abstract terms, in the mind it seems to be present a mixture of images and sounds. Really I don’t know what I’m doing, but it works, somehow, I’m able to follow the process.
Is it possible that when we think, in the mind we see images, hear sound because the thought forms that we build are transformed to the equivalent of sense perception ?

And verbalization, the voice the we hear when we think, what is that ? Is it always a thought form that we perceive as sound instead that as image ? These sounds appears also when I don’t try to create them, in that case what creates them, my mental body acting in and independent way ? For example I sit at my desk and suddenly I hear in my mind: “I must prepare the coffee for tomorrow”.

Really thank for your time