I like how you link the tennis ball scene with the scene with the broken guitar. The theme (or at least one theme) of the movie seems to be that reality is based on mutual agreement. As you say, when the guitar is out of its context it loses it's value, and since Thomas discards it, it has no value to the fellow who picks it up, and he discards it too.
At the end of the movie Thomas is coming to the realization that without agreement (objective evidence that proves it), the murder really didn't happen in any meaningful way. When he hears the tennis ball bounce its the film telling us that Thomas has bought into that philosophy, and that since everyone thinks there is a real tennis ball, and one that he actually threw back, then of course he would hear it.
The guitar is now worthless.
The murder never happened.
The tennis ball is real.
We all agree.
ObamaCare: Making Grandma shovel ready
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