Earlier quoted context omitted.
Pictures are one way, there are other ways too like writing a journal. Camera after all is a recent invention.
Few people have the time to sit and write a journal each day. I tried and it became a burden, a dread before bed time. Sleep won out. Journals can also be electively subjective. Yes, a photo can be framed or posed, but it's harder to edit awkward truths out of a photo rather than omitting them from a journal.
Yet many people seem to have the time to sink in endless time on Netflix, FB, Insta, candycrush or doomscrolling somewhere else.