Twenty years ago, the average person likely owned a single camera, and security cameras inside homes were nearly as rare as they were in cars. But as we enter the 2020s, cameras have become ubiquitous. Most people today have two or more cameras on each smartphone, one or two in each computer and tablet, and at least one — a backup camera — in their car. They may also have doorbell cameras to watch for visitors and package theft or Nest Cams to provide further indoor or outdoor home security. Once you include dash cams and the multiple safety cameras used by cars and VR headsets, it’s clear almost any place can now be “seen” in near real time, a development that some find unsettling.