the individual has not conceptualized this color. For example $f$ defined below is a knowledge-like function.

$$\label{eq:explejapaneseKnowledge}
    f'(e) =
\left\{
    \begin{array}{ll}
        \text{purple}  & \mbox{if } e \in [380, 430], \\
        \text{blue}  & \mbox{if } e \in [430, 520], \\
        \text{green}  & \mbox{if } e \in [520, 565], \\
        \text{yellow}  & \mbox{if } e \in [565, 610], \\
        \text{red}  & \mbox{if } e \in [610, 750], \\
        0 & \text{otherwise.}
    \end{array}
\right.$$

![Illustration of a knowledge-like function of the visible spectrum. The arrows point to the color associated with each wavelength and illustrate the knowledge-like function $f$ .[]{data-label="fig:example_color"}](example_color.png){width="5cm"}

In Japanese the kanji

[UTF8]{}[min]{}青

(*ao*) names both colors green and blue. As in other languages, the Japanese language did not differentiate between these two colors at the beginning of its history. This language could be modeled by the knowledge-like function f’: $$\label{eq:expleKnowledge}
    f(e) =
\left\{
    \begin{array}{ll}
        \text{purple}  & \mbox{if } e \in [380, 430], \\
        \text{green}  & \mbox{if } e \in [430, 565], \\
        \text{yellow}  & \mbox{if } e \in [565, 610], \\
        \text{red}  & \mbox{if } e \in [610, 750], \\
        0 & \text{otherwise}.
    \end{array}
\right.$$ This knowledge-like function $f'$ is different from $f$ given in . Within the same population, 