From stages to screens, I hide a whole world--a one-way mirror, never touched or held--yet the only way to see outside me is to break me. What am I?

I have a shell, but I do not have a tail. I am often seen in supermarket refrigerators and breakfast menus.

I hold water, high up in the sky but when I fall it can hurt or you could even die. I can nourish, but to get me, it's not so easy to try.

My whispers travel where voices can’t reach. Obscure yet precise, I have secrets to teach. Repeated in patterns, though silent to most. Shapes and sounds, but invisible like a ghost. Everyone here can see my name, yet I remain hidden.

I can smell good, but I cannot smell. People use me to disguise themselves..