I couldn't quite figure out what you were talking about there for a second.
Yes it is an odd occurrence.
It is sort of like crop circles. One day they just suddenly appeared.
This bra fence has been around for a while but more and more bras have been deposited over the last couple of years.
It has become such a problem that the local council had to build a $70,000 layby next to it to keep tourists and depositors safe from 100 KPH traffic passing by.
Haven't seen it myself as it is in the South Island and I am in the North Island but would think its quite a site.