You can start by asking a question for the opening statement about theories (that doesn't include I, you, us, we, etc. unless the teacher says so), or maybe state a well-known theory that was proven false, then go off of that.
I need more information to even know where to get started with this. What kind of art? Painting? Sculpture? Writing? Spoken word poetry? This is a very broad "thesis", and unfortunately I'm pretty sure it doesn't qualify as a thesis at all.
