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More speculation:
The tin-clad man is, her boyfriend.
The first Ayu he sees is the part of her that makes the first impression, because that's how he first saw her when he looked in at her, without turning any dials.
After while, he "wanted" to see more, thus allowing a darker, more somber side of her to come through. It's not quite clear what the black symbolises here. Perhaps a darker side of the relationship, or possibly obstacles/arguments/sadness. Or it just could be her serious side.
At this point he knows of the Ayu he first saw, and her dark side. But soon discovers, upon turning her switch, that there's even more to her. The white could symbolise innocence, or just a sweet- angelic like quality. Perhaps the childlike side of her.
I believe the fourth Ayu is last revealed because it reflects a more personal side of her - her sexuality. That's just how I interpret it, anyway. She has apparently opened up to him at this point and is truly comfortable and happy with this aspect - note the look on her face.
And again, as mentioned, the scene in which she lies on the numbers in the rain is symbolic of the "complete" Ayumi Hamasaki, after she has revealed all her sides.
So basically, I think it's a personal/relationship thing.
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