aninteresting relatinship

Art 104
somebody says "see it, believe it". I wish i have this kind of strong mind. "believe" is a big word to me. I like "way of seeing" because it talks about the relationships between "see" and "be seen", and it brings some fresh ideas to me. As a viewer, when i see a piece of art work, i always switch my role from a simple viewer to a artist and then change back. I mean the way of how the viewer seeing is not stable , but the artwork is a conclution.
And then I think how's if the artwork is an action, like a performance artist's work, or a stage artist's work? I guess the performance is still a conclution, since it has been designed(directed) in that way, but psychologically it's not so simple.
And then I think about a woman's makeup, can wwe say it is an artwork? I think so. but how's if she looks(see) her make up through a mirrow? the relationship between the "see" and "be seen" is more interesting, i guess. is that same as when she see her self-portrait?