What does "ground" mean: - The three main grounds talked about are the half hollow, full hollow and extra hollow blades. The major difference is the degree of flexibility that each ground provides with the half hollow being the least flexible, and the extra hollow being the most flexible, and the full hollow being in-between. The more flexible the blade, the more experienced the user should be because the risk of nicks are greater.Yes! Thats sounds great, I know we are getting off topic, but it would be very interesting to see some history on an item like this.