Walls and fencing - human barriers versus cat barriers

Walls, and fencing are cat highways. As every cat knows. They allow us to travel from house to house along the back of a street. They form useful refuges from passing dogs. And they generally make life easier for urban cats.
Yet the joke is that humans think they are barriers.
They put up walls to keep people and dogs out and some are silly enough to think they will keep us out. Just the reverse. They facilitate our movements.
The real cat walls and fencing are scent marks. We leave a scent mark to tell other cats WHERE and WHEN we were. They can choose whether to enter shared territory or stay away. 
Humans do not understand this because they are nose blind. 
And just stoopid. 


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