Your own eyes, unless you look in a mirror.
The wind
this answer might be wrong but i think it is shadow.
It's called backstage
The actor is facing upstage/away from the audience so that (s)he cannot be easily seen by the audience. Generally something to be avoided unless specifically directed to do so.
he had seen it first hand
air cannot be seen because it is colourless
The future cannot be seen but is always in front of you.
No, you cannot be seen on CP.
It depend on what you think. I think emotions and light can be seen and not be seen.
sible
Atom
Although electricity is everything, it cannot be seen!
Atom
The answer to this riddle is "silence." While silence cannot be seen, it can definitely be heard or felt through the absence of sound.
Ultraviolet light cannot be seen by the human eye as it has a shorter wavelength than visible light.
No you cannot it is only seen in the northern hemisphere.
Gravity is a phenomenon that cannot be seen directly, but its effects can be observed through the behavior of objects and bodies in the universe.