String of galaxies

Someone of whom I have always been very fond recently reminded us in another forum that Jan Cox had us study the maxim "There is nothing out there." Perhaps this person's riff on this was where I got the idea but I have myself always thought that if "there is nothing out there," there CANNOT BE anything in here. And as to where that might leave so-called reality, the picture I got from popularizations of string theory is of lines of galaxies, a so thin wall, between unimaginable voids. A line between what is not out there and what is not in here may be all there is.