If you get a high frame rate video of a space, there's plenty of other objects that can act as visual transducers: https://people.csail.mit.edu/mrub/VisualMic/

If you get a high frame rate video of a space, there's plenty of other objects that can act as visual transducers: https://people.csail.mit.edu/mrub/VisualMic/ https://people.csail.mit.edu/mrub/VisualMic/.