How Cathode Ray Tubes Work (youtube.com)

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Lord–bondsman dialectic (Wikipedia) The lord–bondsman dialectic (sometimes translated master–slave dialectic) is a famous passage in Georg Wilhelm Friedrich Hegel’s Phenomenology of Spirit. It is widely considered a key element in Hegel’s philosophical system, and it has heavily influenced many subsequent philosophers.

Cathode-ray tube (Wikipedia) A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. The images may represent electrical waveforms on an oscilloscope, a frame of video on an analog television set (TV), digital raster graphics on a computer monitor, or other phenomena like radar targets. A CRT in a TV is commonly called a picture tube. CRTs have also been used as memory devices, in which case the screen is not intended to be visible to an observer. The term cathode ray was used to describe electron beams when they were first discovered, before it was understood that what was emitted from the cathode was a beam of electrons.