There use to be a maternity hospital in the centre of Glasgow at Rottenrow*. This was demolished a few years ago and replaced by a garden. Now instead of people frantically rushing about you can now sit in a relaxing green space. The safety pin is a reference to the way they use to fasten nappies before they had disposable ones.
*The street name medieval and its origin is disputed but I like the one that comes from several other places with this street name, a row of rat infested houses.