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So, there is this hilarious bug in macOS' new gesture-driven video effects. Some USB cameras can be mounted upside-down and have a setting so that the image gets rotated in software; I think this is just a flag somewhere in USB UVC. This also works fine everywhere. However, the gesture recognition apparently runs before that rotation happens, so it sees everything upside-down. So when a coworker makes the thumbs-up gesture, they actually get the thumbs-down video effect 😂