Every one of these shows uses mirrors as portals into shadow worlds, alternate selves, or hidden dimensions. • Stranger Things — the Upside Down is a decayed mirror world accessed through reflective surfaces. • The OA — reflections signal dimension-jumps and consciousness shifts. • Us — the entire plot is a literal mirror world of suppressed shadow selves. • Behind Her Eyes — astral projection happens through mirrored distortions. • Black Mirror — your screen is the modern mirror, a portal into