Lytro and the Magic Camera
www.bhorowitz.com/lytro_and_the_magic_camera
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
Ren invented a portable technology that captures not just a plane of light, but the entire light field. A light field is defined as every beam of light in every direction at every point in space. Light field research has been going on for some time, but Ren has figured out a way to fit the technology into your pocket.