I need to get caught up on new developments regarding Wheeler's "Participatory Universe" to find out if anyone else is thinking along these lines, but if observation does result in existence becoming--wave function(s) collapsing into the truly concrete--then essentially the history of the Universe occurred instantly when the first observation of it was made? I don't know where that conscious observer would have been located. Earth? A planet like it? Perhaps on every world (simultaneously of course) where the retrocausal positioning of conscious entities made sense?