Your own eyes, unless you look in a mirror.
Microorganisms
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
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.
Atom
sible
Although electricity is everything, it cannot be seen!
For things that can be seen are temporary, but things that cannot be seen are and aim; and when this is the case, afflictions cannot be said to work for such.
For things that can be seen are temporary, but things that cannot be seen are .... But the things which are not seen are eternal The clause is important, as showing ... and aim; and when this is the case, afflictions cannot be said to work for such.
Atom
No you cannot it is only seen in the northern hemisphere.
Some can, some cannot
The wind