If you watch a lot of TV you may notice that sitcoms all tend to look the same. This has to do with the placement of lights on set.
Karl Freund was an innovative filmmaker in the 20s & 30s, but eventually he took on the challenge of lighting television shows with a 3-camera setup. Freund also used cameras on dollies & microphones throughout, among others. He started with “I Love Lucy”, and his techniques are still used today.
Vox went in-depth into Freund & his history in television with the video below, that we highly recommend.