Ah, you're right, feel my mind was the first.
But like you mentioned I always thought she was depicting Yin and Yang there, which is more of an abstract concept. With Best ~third universe~ she took it to a personal level the first time (the old Kuu for the best album, the light side, and the current Kuu with the dark edgy space theme directed towards future for the new album).
But then I take a look at grow into one, which already had the the theme of identity and acceptance, and notice that W FACE is like a combination of her old album themes!
Every artist has recurring themes in their work, like a trademark.
For Kuu it's duality and identity, for Ayu it's loneliness and her one-wing metaphor. And those themes make sense if you look at the artist's vitas.
Every artist is therefore recycling, it's inevitable, the art is to give it a twist to something new.
Luckily Kuu and her team are pretty good at that.
Btw. you can also take the new re(live) promo pic a step further, cause she is forming a triangle (or several) with her hands and face, hehe.
Such a simple pic, but pretty effective in context.
Or you only look at it and simply admire the beauty and nostalgia.
