My grandfather nonchalantly pounded nails into posts and hung various things on them. So that things didn't fall off these nails, he unconsciously pounded them in at an angle. To me, these felt like the most rational sort of hook you could get. While a simple nail would have sufficed, I made a few alterations. It struck me that if you could secure a nail at a set angle and length every time, then you could have beautiful hooks anywhere you could pound a nail in.