We all have some experience of a feeling, that comes over us occasionally, of what we are saying and doing having been said and done before, in a remote time - of our having been surrounded, dim ages ago, by the same faces, objects, and circumstances.
You try and nurture the relationship. This day and age we have to do a little more networking than we used to do. All that does is make sure you befriend the people you are working with on a project so you hopefully carry it over to the next one.