Remember those racks of free postcards you used to find in cool cafés and inner city cinemas. That was a local company called Avant Card. And after 25 years, they're just about to shut up shop with their very last print run.This week on Communication Mixdown, Pat Mackle, co-founder of Avant Card, talks about how it all started, her view across a quarter of a century of cultural change, and the finality heralded by what's been called the digital disruption.