Although short and merely a singular shot, the construction of this shot in class served as a great reminder of the existence of shifting focus mid-shot and of its uses. Personally, I tend to forget about this neat little trick, more focusing on trying to perfect one shot on one character/object and then pairing it with a reaction shot. The focus shift however, allows us to eliminate the unnessecary reaction shot and condense the two into one seemless shot, (this is just one of the many applications of the technique).  So what does the shot specifically entail? It is the simple shifting of the cameras’ focus from one subject to another, whilst being stationary, in order to shift the audiences’ focus. (to move the camera whilst shifting focus would be a pull-shot – as popularised by Jaws).
Additionally, it can establish relationships between items and/or characters;  by pairing the two into a single shot instantly creates a connection between them, and can be done via a characters’ gaze, referencing of dialogue, reactionary by emotion, or even silent –inferring relativity is yet to come or will become of importance at a later point. Whilst simple, the exercise proved to be a valuable reminder that the technique should not be overlooked, nor be taken lightly, and can be of great use to creators when utilised correctly.