The abandoned lighthouse was always so fascinating to me. Lost Library has some clear answers as to what it could have been before being forgotten, but this place is a mystery. There's signs someone lived here, Sunny's family portrait from the real world is on the wall, and the map of truth says this place used to be an entrance to Black Space. And this lighthouse only exists within this pocket area you can only access during this sequence, otherwise it doesn't have a physical location in Headspace we can find. What did this place used to be? Who lived here? Some version of Sunny's dad? Maybe Sunny's real family portrait being here implies this place predates Sunny taking on the form of Omori? It's a mystery. One that's answer was lost to time, leaving it here as a relic of what used to be. So enchanting.