My boyfriend's family has something similar, though a bit less scientific-looking. In the hallway of their house they have one big picture frame with 18 pictures of my SO's brother, one big picture frame with 18 family photos, and one big picture frame with 18 pictures of my SO. They're all either professional portraits or school photos.
Even in that setting, it's very easy to see the progression.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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