Links between relaxation and productivity also speak to the value of variety
This article about how critical rest and relaxation are to productivity also, without saying it, has a lot to say about the value of variety! Enough rest and relaxation add variety to your life. I also think, in addition to rest and relaxation, variety itself can be rejuvenating, as well as lead to creative and innovative ideas since you have a wider range of experiences to draw upon.
http://www.nytimes.com/2013/02/10/opinion/sunday/relax-youll-be-more-productive.html
Variety People 
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