It really depends on whether the viewer recognizes a surface as reflective, doesn't it?
For that reason, I'm going to say no to figments and phantasma, and yes to glamers, shadows, and patterns. I agree with the reflected-pattern-has-no-effect, but if you wanted to take a page from China Mieville, you could say that a doubly reflected pattern does have an effect.
I don't think figments should be reflected, because the viewer believes them to be real. Therefore, if they don't show up in the mirror, then it is the mirror that is magical!
For that reason, I'm going to say no to figments and phantasma, and yes to glamers, shadows, and patterns. I agree with the reflected-pattern-has-no-effect, but if you wanted to take a page from China Mieville, you could say that a doubly reflected pattern does have an effect.
I don't think figments should be reflected, because the viewer believes them to be real. Therefore, if they don't show up in the mirror, then it is the mirror that is magical!