With the characters able to move between the Upside Down and the Rightside Up, every street, house, and store in Hawkins must serve double duty. Each must transform into its Upside Down version—and back again—fairly quickly. That involves adding the inky tentacles made from painted black pool noodles with wire running through them to each set. Production designer Chris Trujillo tells me that if you were to line up all these vines back to back they would stretch 52 miles.