As you can see, the tennis ball up there can't define itself merely by its existance. In other words, if a tennis ball exists in empty space, and those who discover it aren't familiar with the game of tennis, the tennis ball will exist only to define its physical properties (whats on the surface), but its existance doesn't indicate it's true purpose (why it is there).
To me, meaninglessness means to have no use. In this definition, this doesn't imply purposlessness because what if the purpose of the tennis ball is to get its discovererors thinking about why it is there in the first place? After the discoverers of the TB think about that, they will try to find uses for it, and after a while they will find thier own purpose for it. They may not use it how it "ought" to be used, but then again people don't use tennis balls just for tennis either. You can make up all kinds of games that involve the use of a tennis ball.
This doesn't really apply to a human (who has thier own thoughts and feelings), but there is a slight similarity. Our bodies exist because our minds recognize them as being there, and they allow us (minds) to tranceive communication through the physical environment our bodies exist within. To deny this experiance is to be close-minded to our reality. Granted that this may just be a "surface" description of our reality, it is true in its own level, just as newtonian mechanichs is true on a classical scale. What happens when we play tennis? Why do we partake in such activities? Is there any meaning in a game of tennis? Is there any purpose? One can feel that there really is no meaning or purpose to the game and all its facets, another can feel that tennis is the most intricate and amazing thing that humans have ever created, and that all of the lessons of life can be learned from the game. Who is the "enlightened" one here? Who is right? Is my entire post meaningless?