It is a bit more complex than that; what matters is the correlation between the initial trajectory and when the batter's vision believes the ball will go. The d

It is a bit more complex than that; what matters is the correlation between the initial trajectory and when the batter's vision believes the ball will go. The dry spitball (knuckleball) and the spitball work on the same concept (i.e., the lack of spin will cause the ball to react differently than pitches with spin).