People usually organize their photo albums chronologically, i.e., first the pictures of one given year, then the next, and so on.
But a while ago I thought it could be done by age of the photographed subject, or simply by subject. For example, a collection of family pictures of babies. Or first school day pictures. Or wedding photos. Regardless of the year or the generation, but always the same family.
So far I've managed to collect one series of four babies.
Each baby is a parent of the baby in the next picture, except for the picture with two boys where it's the youngest who's the father (and grandfather) of the babies in the next pictures. These pictures give a hint of physical similarities (full dark haired heads, tiny mouths and rounded cheeks seem a pattern, although photography can be the ultimate lying device), of reproductive patterns (that 30 years loop can't be just a coincidence), fashions and... who knows? With time we'll get more clues to read series like this one.
By the way, there is a picture of all four of us at the same time. I think it just says how precious life is, and how strong family bonds can be.
And probably that we grow up to look only like ourselves, and nobody else.