justify the title of novel 'invisible man'?

The story's narrator is the invisible man. He remains nameless throughout the text, but the further we read, the more we come to understand his journey to invisiblilty. Our protagonists invisiblity is not, however, physical or literal, but rather metaphorical. Rather than be seen in light of sterotypes and preconceived notions, he decides he doesn't want to be seen at all, something that provides him with freedom.