Not always. Sometimes it is in the most unusual places. On the Hollywood hills for example

And I like this one on paper 

 

and this one  on a fence   

 

to read extracts from any of my books click on my Amazon page; http://www.amazon.co.uk/Tom-OBrien/e/B0034OIGOQ/ref=sr_tc_2_0?qid=1388083522&sr=1-2-ent