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This project, I believe, would benefit most from a simple laptop screen with a webcam inside the bezel. The small size enables a better correlation between the user's face and the position of the creature on screen. There is also a consistency in the position of a laptop webcam (centered at the top of the screen). Larger screens and desktops with user-mounted webcams introduce more (unwanted) variability. Another option would be to have a monitor and webcam pre-setup at a public space. In this latter case, the project would become much like a virtual aquarium, and webcam position can be controlled.
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