Even if you accept the premise that an internet encyclopedia should be written from a neutral point of view, it is clear that some knowledge is contested within cultures, such as whether the population of Israel should include occupied and contested territories, or whether Catalonia is better described as a Spanish autonomous community or its own country. If more language editions relied on Abstract Wikipedia as the central source of truth, then this dominant point of view could replace alternative perspectives. But Vrandečić countered that each volunteer community could decide for itself whether Abstract Wikipedia should be used as a baseline. The Wikimedia Foundation, the nonprofit organization behind Wikipedia, will not mandate that different language versions be forced to use the machine-readable, abstract version. That means that, for example, Hebrew Wikipedia and Arabic Wikipedia could each continue to present very different articles for the topic of Jerusalem.
The visual light spectrum starts at around 380nm, if we arbitrarily assign that to be "C", and we ascend(ascending wavelength, descending frequency) from that with the same 12-tone "equal temperament" used in music we get:
C 380
B 402.595975856532 ~violet
- 426.535578357562
A 451.898703701034 ~blue
- 478.769998960052
G 507.239144584613 ~green
- 537.401153701776
F 569.356689213139 ~yellow
E 603.212399747916
- 639.081275592823
D 677.083025786658 ~red
- 717.344477638087
C 760 infrared
With 760 being one "octave" below 380, though the visual spectrum ends at around 740, which means the visual light spectrum is a bit less than one octave.