Laser/torches work well for tracing the geometric plane lines - i get this
Covering seems to work better when you have a club in your hand...anyone agree? ie. when you are really hitting the ball.
Sometimes the accuracy of tracing with a club can be poor and covering is an easier to acquire skill and use when you are practising with balls and sweetspots .... providing you have acquired the mental development to provide "object permanence" - it should not be too shocking!
If you buried ( in a fairway bunker for example) an "arc of approach" plastic strip ( flexible) partly underground ( ie. the bit from ball to low point and beyond) and left the remaining bit exposed as a visual aid for swingers backswing and downswing ( preimpact) it would appear to provide a better aid than the "vision track "for swingers ( because it shows arc not angle) AND (if sand were wet and firm) the shape of the divot would uncover the buried arc IF YOU WENT DOWN TO LOW POINT ON PLANE....
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