Yellow Standout

I was listening to a photography podcast today.  They were answering questions about various camera techniques.  Someone asked how to isolate a single person in a crowd. 

Their first obvious answer was to make use depth of field to make that person in focus and the others out of focus (you can control this with the aperture, bigger is better).  Or, use a longer lens and narrow your field of view.  Or, try a different perspective.  Or, if you have control over the scene, put a red shirt on the guy. 

Well, I had no control over the crowd here, waiting to cross Broadway.  But yellow works well also, ay? (Especially when a matching cab passes by).