I noticed this poster the other day.
I seem to recall that you have to encounter a word or expression a certain number of times before it enters your vocabulary. So perhaps desire line will soon become an everyday expression for me. I've come across the word twice now.
The last time I wrote about it I used the slightly different expression desire path, so I thought I'd better check out the definition at the Australian Centre for Contemporary Art. They say:
Yes, that about describes the situation in Clifton Hill where the council seems determined to regulate our favorite short-cut out of existence.
It sounds like an interesting exhibition: