There’s a fairytale aspect to the viva.
Generally there’s a rhythm and sense of how one will unfold. More often than not, a clear sense of beginning, middle and end, patterns by which the story comes together.
Only a few important people in the story, a clear protagonist, a series of challenges – though thankfully no goblins, ogres, giants or trolls.
And like fairytales, when you ask around you discover that nearly every viva has a happy ending.