Ghosts, spirits, and other non-human entities have long reached out to us from realms beyond our everday worlds. Many see them as imaginary, the product of active imaginations or media companies. Others feel their presence in tangible ways, and even seek to communicate with them. A whole industry has sprung up to detect them with technology, and to understand what they have to tell us. The shows in this playlist invite us to ask: what's real? Is the world we see and experience all there is?