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https://spectrum.ieee.org/automaton/robotics/humanoids/what-people-see-in-157-robot-faces

If you're designing a face for a robot or chatbot then you will find this article extremely useful. It describes the detailed analysis and evaluation of 157 different styles of robot faces, and the ways in which different people react to different features. There are some very clear do's and don'ts for choosing the face of your next digital minion.