So when I was little, numbers did have genders and roles (and colours attached to them) I would normally have a storyline attached to each of them. I remember 2 was female, 4 was a princess that wore pink and such... I grew out of it.
With music, I can separate the different layers of a song, and can create different projections in my head, when I was a teenager I enjoyed doing that. You could say, that whatever I imagined created an extra "visual" layer".
In the past when I've been very happy I could "paint with colours" and see the colours as another translucent layer.
Same when I've been very much into something I'm reading, I can see the letters glow and almost float.
Whenever I'm really happy with my DH, I can see both of us in a field, and I can feel the breeze, the grass, the flowers.
All of this is pleasant and can block it out if I want to. I've always thought it was just having a very vivid imagination, as I can trigger it too (at least the music related ones).