There is a photograph you never took, because you were inside it. Some ordinary afternoon you only recognised as good afterwards.
Enjoying a moment while it is happening is much harder than enjoying it in memory. Attention is booked out by logistics, and the good moment goes past at the same speed as everything else.
A few can be caught. It takes an odd deliberate act: noticing, mid-scene, that this is one of the ones you will want back later.
Try it once today. Stop for four seconds in the middle of something unremarkable and mark it.