This , lay down in the and you ' ll get lucky with not dying from grenades eventually . <| sep |> That ' s an assumption . It may be that the reveries were an initial part of making the hosts as lifelike as possible , and that after the incident with Arnold proved too dangerous to keep as part of their code . It ' s also quite possible when we see the update come into play in the present Ford isn ' t actually the one who made the addition , but instead lied to cover up the fact that Arnold had and he wasn ' t in complete control . To add to this theory , the scene where Ford calms down Maeve after losing her daughter shows him playing a song for her . He says it is an old trick from an old friend . The name of that song ? Reverie .