Irrational Productivity

What makes a day productive? Every day is different, every person is different, all goals are different. I suppose that is like asking, "what is happiness?" 

I constantly have this irrational drive for productivity but don't have a clear definition of what it is or what I'm being productive for. Does there have to be a specific task? Does the task have to relate to particular end result/future goal? What is effective productivity? Or is that a redundant statement? 

Who knows, who knows, back to it!