protecting/shielding ones self from negativity

[Jeremy]

So I'm interested in how everyone goes about shielding themselves from negativity. For a time, I was able to ignore such energy by simply walking away or trying to add a positive spin on a situation. But over time, the incessant negative nature of coworkers will pull me into such ways of thinking then I'll catch myself and try to ignore it. Unfortunately, we work in such a confined work area, I can't simply walk that far away. 

So I'm interested in techniques that allows ones self to bypass this unfortunate vortex of negativity and keeps you on the positive line of thinking