Mapping my own growth direction

Good afternoon gents, a bit of a different direction with today's post as I'm not yet ready to write up the next blade review.

There has been something bothering me since I started wet shaving again and I see it come up regularly on forums such as badgerandblade and Reddit's own r/wicked_edge. The direction of hair growth in my beard is something which I've always assumed was very straight forward. In fact, I remember my dad telling me " you shave with the grain, so downwards on your face and upwards on your neck" when I started shaving in the mid 90s. Maybe that's how his growth comes in, but as I've recently found out... that trait was not passed down to me.