Postmodernism versus Modernism

I often like to compare and contrast; a basic structure for a deep discussion, but hey... at least its a contribution. The first term Modernism, a definition for this would be anything in the nineteenth century up to this era. When we apply the term to art, the differences varies from different views of artistictic expression. What I love about it, is the organization of each piece presented. For example, a movie that is modern has a lot to do with this generation, more than likely. It always have some type of professionalism that attracts me, because that was embedded in me. It seems society teaches that modernism, has a lot to do with transmitting. It gives a large amount out to us, but it doesn't leave enough room for interpretation. While on the other hand, Post modernism, or should I say theories behind the term, usually states that it leaves room for complexity, and different views for the viewer, reader, observer etc. This is basically what our modern culture excepts as popular, but is that also constructed. What these two terms have in common is basically standards set by society. There are certain expectations met, to make anything Modernism or Post modernism. This links back to our category analysis, once this becomes a category it's hard to say that its any more authentic than its opposite. In this case Post modernism seem different from modernism, but what if they are one in the same? This is just a question that aroused in my mind, while writing this in my blog, I'll let whoever reads this answer that.