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The Differences Between Active and Passive Sensing
Most of the senses can be active in some way, right? So I am sitting here and I am seeing things in front of me, but I can also look around and I do. And that act of gazing around a scene is active. Similarly, like you can sniff with your nose, you can press and explore with your hands. It's hard to do with your ears. The crucial difference between those kinds of senses and things like echolocation is that the latter are always active.