CGA's "Composite" mode contains output artifacts, a trait also found in other early microcomputer graphics like those of the Apple II or Atari 800; with careful use of dithering, CGA can be expanded to a larger effective gamut[0] although most games wouldn't be as ambitious as this demo. It's not as well-known or used as the 4-color modes because it wasn't supported by later PC graphics adapters, nor was it in the spec of the standard monitors of the era. You can see this system struggle to reproduce the demo's intended look: [1]
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CGA's "Composite" mode contains output artifacts, a trait also found in other early microcomputer graphics like those of the Apple II or Atari 800; with careful use of dithering, CGA can be expanded to a larger effective gamut[0] although most games wouldn't be as ambitious as this demo. It's not as well-known or used as the 4-color modes because it wasn't supported by later PC graphics adapters, nor was it in the spec of the standard monitors of the era. You can see this system struggle to reproduce the demo's intended look: [1]
[0] Example: https://www.youtube.com/watch?v=TfVe9l77zLU
[1] https://www.youtube.com/watch?v=aibZKrXc8Nk