One major plot point that has been yet to be revealed is what has Ford done to stop Arnold from developing artificial consciousness in hosts . I think the show has hinted that Arnold has done some things that Ford has not been able to eliminate . I think the Reverie song is a major clue in another way . Think about the song and the code . For the songIt calms Maeve down , but she tells Ford that the pain is the only thing she has left of her daughter . Then Maeve gets wiped and suicides afterwards . For the codeIn Ep 1 , Bernard mentions that Ford added the code last minute probably to keep it a secret as best as possible . The reveries were tied to specific memories . When Elsie asks how it is possible to access previous memories that were purged , Bernard says they are waiting to be overwritten . He mentions Ford found a way to access them . We obviously see further evidence of memories from the reveries code elsewhere . This cannot be overlooked . Maeve starts having flashbacks of the MiB killing her daughter when the reveries code went live , while Teddy and Dolores start remembering what the MiB did to them . It ' s possible Bernard may have the reverie code , hence the flashback of him strangling Elsie . I agree with the hunch that Arnold showed Ford the trick with the song , which is why this reverie code might be what Arnold was calculating Ford would do eventually . The reverie code brings back their suffering from memories , which could very well be the top of the pyramid for Arnold ' s theory . Perhaps Ford thought the reveries code was a fix to a problem without knowing that Arnold anticipated this maneuver .