1.0 link Rainbow Dash Network http://rainbowdash.net/ Narwhal (narwhal) http://rainbowdash.net/narwhal http://rainbowdash.net/notice/3863788 @<span class="vcard"><a href="http://rainbowdash.net/user/8281" class="url"><span class="fn nickname mention">loveydoe</span></a></span> It's because while our perception of the wavelength is qualitative the wavelength itself is quantitative. Like it or not, regardless of <i>how</i> we see the wavelength the wavelength itself can be measured and distinguished. Regardless of what you interpret, it's an objective fact that, as an example, a 620–750 nm wavelength will produce a colour we refer to as &quot;red&quot;, regardless of what red is. The only presumptions I'm making are those grounded in reality that can be generally agreed upon, but you're right in that I didn't account for your outlandish solipsist perspective. I'm out.