Inverted spectrum problem

The inverted spectrum is the hypothetical concept, pertaining to the philosophy of color, of two people sharing their color vocabulary and discriminations, although the colors one sees—one's qualia—are systematically different from the colors the other person sees.

1. What is the purpose of inverted spectrum?
2. What does inverted colors mean?
3. What is called the problem of absent qualia?
4. What is inverted red?

What is the purpose of inverted spectrum?

The aim of the inverted spectrum is to make plausible the idea that colour experiences could be the same in their colour-representing aspects but inverted in their colour- feeling aspects.

What does inverted colors mean?

Color inversion is a photo effect that flips all colors to their opposite hue on the color wheel. For example, white becomes black, green becomes magenta, and blue becomes orange. The interest in color-inverted photography started with analog photography and film negatives.

What is called the problem of absent qualia?

The absent qualia hypothesis is the hypothesis that functional duplicates of sentient creatures are possible, duplicates that entirely lack qualia.

What is inverted red?

The inverted color of Red is considered to be pure Blue-Green.