Caleb is a robot
I thought this was obvious but after searching around, not many people came to the conclusion after Caleb cut himself and drew blood. However, all you need to do is think about when Ava asked him his first memory. He starts on a memory of kindergarten, she says he's lying. He hesitantly tells of his true first memory, just a color and a sound. The color blue. The sound must have been a bell, then. The company is Blue Bell. Think about what would most likely happen when you turn on one of their screens. Computers give a color and a jingle. Blue Bell's would be blue with a bell.
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