[This story contains spoilers for HBO’s Westworld season 4.] When HBO’s Westworld revealed its massive mid-season twist — that Aaron Paul’s Caleb had become a host — it inched this cerebral series closer to answering its longest-running question: what makes something human? It’s a quandary the series’ special makeup effects team has had to not only help Westworld visually explore throughout the show’s run but in the face of several of its leading heroes and villains becoming hosts, alongside the introduction of a new series of drones imagined by Hale during its fourth season. Executing that thematic exploration with Caleb took place during the season’s sixth episode, “Fidelity,” where host version #278 attempts to break out of Hale’s glass cage after she seeks to isolate what has made Caleb’s human consciousness resistant to her mind-control tech. In the process, Caleb runs into a series of frightening discoveries: past versions of him, all in various forms, have attempted this same escape to brutal results. “That episode was maddening,” Jason Collins, special makeup effects designer on Westworld season four tells The Hollywood Reporter. “Anytime you shoot one person as multiple people, you have to get a bunch of people that are roughly his…
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