[ExI] Red

[Brent Allsop]

Hi Ben,
Exactly, qualities like redness are 'mental construct' rendered into our
subjective knowledge of the world in our head
<https://www.youtube.com/watch?v=suTugEv9F-U&t=8s> .

There are all kinds of evidence, like magenta, that there is a LOT of
difference between patterns of reflected light and the qualities of our
knowledge of such.

What is a 'mental construct' if not something objectively observable in our
brain?  In addition to our objective descriptions of those mental
constructs (we don't know which is a description of redness, but it must be
something), there is some reason the redness quality is behaving the way we
objecetively observe it behaving.


On Tue, Jun 30, 2026 at 5:39 AM Ben Zaiboc via extropy-chat <
extropy-chat at lists.extropy.org> wrote:

> On 30/06/2026 11:45, John K Clark wrote:
> > On Mon, Jun 29, 2026 at 5:39 PM Ben Zaiboc via extropy-chat <
> extropy-chat at lists.extropy.org> wrote:
> >
> >     > We have a colour called Magenta, but it doesn't correspond to any
> wavelength of light, or any band of wavelengths.
> >
> >
> > According to Google: "Magenta is a unique, extraspectral color that does
> not exist as a single wavelength of light in the visible spectrum. Instead,
> it is created by the human brain filling in the gap to bridge the opposite
> ends of the color spectrum—mixing short-wave blue light and long-wave red
> light"
> >
> > And if you decrease the amount of red light a little and increase the
> amount of blue then your brain interprets that as purple instead of magenta.
>
>
> Indeed. So, I'm wondering what Brent will have to say about this. Magenta
> doesn't seem to fit into his view of things, as it cannot be a 'physical
> property' of anything, it only exists as a mental construct, or a
> hallucination of our brains.
>
> --
> Ben
>
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