For example, there’s a temperature field corresponding to the air around you: there’s a well-defined temperature at each point, totally independent of any human-invented voxels, and you can measure the temperature number by holding a thermometer there—or your finger, if you don’t need great accuracy. There’s also a pressure field: at each point, there’s a pressure number which you can measure with a barometer—or with your ear, which will hurt if the number is too extreme and which can detect sound if the pressure is fluctuating over time.
