Using the descending tetrachord you can see the hand shapes on all of the instruments.
A simple descending major scale.
The movement of low and high second finger is shown in close-ups of the violin hand.
These are especially useful in early stages of string playing to free the player’s left arm placement and to secure the instrument hold and match pitches of the octave.
The relationship of the left thumb in shifting is clearly demonstrated in the violin close-ups.
This is a short video close-up of the cello backward extension left hand shape.