https://www.youtube.com/watch?v=u2EdhUqyxFo
Eventually, the animatronics are updated into androids.
https://en.wikipedia.org/wiki/Replicant#Term_origin
https://en.wikipedia.org/wiki/Westworld_(1973 film)#Plot
Then eventually, its very advanced AI-Robotics and sentient props...
https://en.wikipedia.org/wiki/Westworld_(TV_series)#Summary