"I thought with the aliens, you’d think, “I don’t want to sit next to that on the bus, they look insane, they look barbaric.” And then by the end of the film, you’ve done a 180 on your perception of them. And that’s why their design reflects that. They are gross. They are insect-like, which represents this sort of hive-structure society that they come from, and then they have a human sort of geometry to their face and eyes, so that at some point in the film, you can feel that there’s a sentient creature behind those eyes. So they have to have both of those two things, which is a bit of a balancing act."