title: What is the Hexagon design pattern
body: <p>I've been watching this <a href="https://plus.google.com/events/ci2g23mk0lh9too9bgbp3rbut0k">https://plus.google.com/events/ci2g23mk0lh9too9bgbp3rbut0k</a></p>
  
  <p>they mention a term I am not familiar with </p>
  
  <p>What is the Hexagon design pattern ?</p>