It might be something like glass..

..because one wouldn’t notice it normally.

However, it is actually there.

As proof, if you change the angle you look at it,

The glass will reflect light.

It will state its presence and existence more eloquently than any other thing in this world.

Even if it’s tainted by sadness,

It still possesses a transparent, glass colour.

It’s still there, for you, for me, for everyone.

[On Happiness] Lelouch ~ Code Geass: Lelouch of the Rebellion