The most important thing (in my opinion) is how a player learns to calibrate the shot angle to a feeling generated by seeing a certain connection between the Cue Ball AND the Object Ball.....a "Connection System" if you will....this is why all aiming systems "can" work, but ONLY if the angles are calibrated in some way/shape/form to "how your eyes see the correlation between the two balls forming the correct angle"....there's more than one way to do this.....I can make many "aiming system" work because my eyes already know the correlation between the two balls (I'm creating the angle, then "allowing" the aiming system to work"....so I can "feel the shots with my eyes"....this may sound esoteric, but I assure you it's not.