I like this one. I know that the side of the hexagon is not that relevant, but seeing most of the time the driving/driven ports be splitted in some way, we get use to see this visually. And probably helpfull for beginners. Thanks!

Hi Alistair,
It's not really an error but it can be confusing to haven a driven port on top left. "Hydra Network" using both kinds of port make it impossible to move it on the right but I think all driven ports could be on bottom and the driving port on top. Here is a sketch of my thought.