The iPhone 8’s facial recognition sensors “can deeply sense a user’s face in the millionths of a second,” The Korea Herald reports. The source claims 3D sensors will be integrated in both the front and rear cameras to provide augmented reality experiences in real time, but provided scant information on how they would work. In an effort to answer that question, The Wall Street Journal points to Apple’s 2013 acquisition of PrimeSense, an Israeli company that helped develop Kinect motion sensors for the Xbox 360. That depth-sensing technology — referred to as “structured light” — emits thousands of tiny infrared dots and senses their reflection to gather highly accurate depth information that could even be used to unlock the device in total darkness. Apple declined to comment, but leaked firmware for the HomePod seems to reveal that the iPhone will have some form of depth and facial recognition sensors.