Sky mirrors again

People are really enjoying the Anish Kapoor sky mirrors - I found myself there again on Sunday, a fine bright afternoon with lots of people in the park, and the usual bird life -Since last week, a path towards the large mirror across the Long Water has formed -
One name for such paths is "desire lines". I'm continuing the search for another term, encountered some years ago, used to describe such paths, especially those made by runners who prefer grass, alongside pavements. (During the search I found this walking project that links Detroit and South Africa; unfortunately it seems to have finished in 2006.)

Around the C-curve, the ground is turning into a sea of mud -
Security guards are protecting ... the grass inside the rope.