Read the following summaries of the original text and decide which one retains the main idea with vocabulary and structure changed. "Art does not evolve by itself. The ideas of people change, and art changes in order to express these ideas. If an artist changes his way of expressing himself, it means that his way of thinking and seeing reality has changed.If the change is consistent with the changing ideas of his time, then his work has improved; if not, then it has deteriorated or failed.