Blog #4 - short stories

For me, Metamorphosis is the most complex, the most difficult to understand. Why a bug? The entire thirty pages described the life of a bug. This seemed simple to me, but I can't find a greater purpose for it. As far as the title goes, I can only see the metamorphosis as his change into a bug. His relationship with his family doesn't change. He is not, at any point, important to the family as anything other than a source of rent. He doesn't interact; he is cut off from the family even before his physical change. his family doesn't change - they alter their habits and get jobs, but they eventually fall back to their original state. Can any one clue me in on the interpretation of this?