1:2 is special in that it gives the maximum possible consonance when using harmonic timbres, but there are other good scales built around different ratios. See:

1:2 is special in that it gives the maximum possible consonance when using harmonic timbres, but there are other good scales built around different ratios. See: https://en.wikipedia.org/wiki/Bohlen%E2%80%93Pierce_scale https://en.wikipedia.org/wiki/Bohlen%E2%80%93Pierce_scale https://en.wikipedia.org/wiki/Gamma_scale https://en.wikipedia.org/wiki/Gamma_scale