Layers of depth in a fluid is the best metaphor I have.

The 'top' 'layer' is the 'loudest.' It has the word-thoughts. If I want to solidify ideas and plans into an expressible form, it happens here. Almost everything that comes out of my mouth is formed into word-thoughts first, and then repeated aloud. If I want to 'rubber duck' a problem, I do it here. Sometimes 'bubbles' come from below and disrupt the structure of these thoughts.

The next 'lower' 'layer' is the image space. Things I am actively imagining are here. Images, 3D forms, music, conceptual mapping, etc.

The next 'lower' is the semi-conscious. Thoughts I haven't established fully into expressible thoughts or images are here in half-graspable form. Sometimes it feels like something lower pushes elements up into this space as 'important.' Sometimes those things are pushed up strongly enough they press into the layer above.

I can sometimes sense things happening deeper down, parts that are processing inputs in ways my metacognition can't perceive.

Across the whole space is a certain turbidity representing emotional disruptions and physical mental hindrances like lack of sleep, etc.