HF motion sensors are now used in a lot of lights. They are 5.8 Ghz radars that detect motion even through walls. So high frequency motion detection is already

HF motion sensors are now used in a lot of lights. They are 5.8 Ghz radars that detect motion even through walls. So high frequency motion detection is already used in a wide range of applications. But I think 'seeing' should be taken with a grain of salt. Yes you can detect motion behind a wall but creating an image is some steps away.