Why audiophiles are different (explained with color)

... ya probably should be a little more humble and think twice, three times for some of ya, before posting this elitist drivel.

There is no wavelength assigned to indigo. If you want a number, it's around 445 nanometers, but it doesn't appear on most spectra. There's a reason for this. English mathematician Isaac Newton (1643–1727) coined the word spectrum (Latin for "appearance") in his 1671 book "Opticks." He divided the spectrum into seven sections—red, orange, yellow, green, blue, indigo, and violet—in keeping with the Greek sophists, to connect the colors to days of the week, musical notes, and the known objects of the solar system.

So, the spectrum was first described with seven colors, but most people, even if they see color well, can't actually distinguish indigo from blue or violet. The modern spectrum typically omits indigo. In fact, there is evidence Newton's division of the spectrum doesn't even correspond to the colors we define by wavelengths. For example, Newton's indigo is the modern blue, while his blue corresponds to the color we refer to as cyan. Is your blue the same as my blue? Probably, but it may not be the same as Newton's.