When I was a kid, I was fascinated by color, and in particular, there was one question

which had me up late at night thinking about it, which was this.

Can you think up a new color?

Now if you've seen a rainbow, then you know that the whole spectrum of visible light

is reflected there.

We have all the reds, all the oranges, all the greens, all the yellows, all the way up

to the blues and the violets, and you can see there all of the colors that you can perceive.

And of course, it makes you wonder about color.

How does color work?

What is it really?

And it also connects to some deep questions about philosophy, not just physics.

For example, many people have wondered, they're colored that I'm seeing red.

How do I know that other people are seeing the same color?

Right?

Maybe the thing that I see is red somebody else sees as blue.

A fascinating question in philosophy.

But there's another question there which is, can you think up a new color?

If these colors that I'm seeing are just perceptions in my mind, is my brain capable

of calming up with a new color?

Can I generate in my own head a new experience of color?

I spent many nights thinking about whether it was possible to concentrate hard enough

to come up with a new color.

...