“It turns out the ideas presented in the Stranger Things episode “The Flea and the Acrobat” are pretty much spot on. In the show’s analogy, an acrobat on a tightrope can move only forward or backward, but a flea on that same tightrope, working on a much smaller scale, can move all around the rope, in other dimensions, seeing more of them.
Since we’re the acrobat in this analogy, the question is how to test if extra dimensions really exist. One way of seeing evidence for other dimensions involves gravity – specifically, the theoretical particle associated with the force of gravity, called the graviton. One theory suggests that the graviton may move in all dimensions, not just the ones we live in. And if we can create gravitons at the Large Hadron Collider at CERN, we might be able to see evidence of them leaving our dimensions for other ones.”