Your MacBook Has a Force Field. This Is What It Looks Like

Cool they measure using a modified android phone's sensor!Wish Faraday lived to see these field lines for real just once!How about devices that measure and use this field data to identify objects in real time to build a map around one?I don't think ill be the first one to think of this but has someone else done this before?

Should you want to reduce the field entering your body, how would you go about it? I learned about Faraday cages back in school, but you can't surround the laptop with one of those and still use it... I believe medical devices have shielding built-in, which I imagine is an earthed metal box, so earthing the metal laptop case?