In a red country, everything is red, and people are happy.

Blue country everything is blue, people are melancholy.

In yellow countries, everything is yellow, and people are neither happy nor depressed, and there is no expression on their faces.

Marven asked the mayor of the melancholy blue country, "May I ask why the rainbow here is not colorful, but blue?" ”

"Rainbow? Do you mean the one who appeared in the sky yesterday? No, no, that's not called a rainbow, that's called a blue rainbow. Of course, that thing is called Honghong in the big red country, and yellow rainbow in the big yellow country. There are only three colors of rainbow: red, yellow, and blue, how can it be colorful? Woo-woo-"

Marven said: "It is normal for people in the big blue country to like blue, love to raise blue plants, love to live in blue houses, and love to wear blue clothes. However, the rainbow in the sky is also divided into red rainbows, yellow rainbows, and blue rainbows, which is not normal. ”

"Why? Woo-woo-" Mayor Mare, wiping away tears, asked.

Marven is really not used to why these people from the big blue country can be so sad all the time.

"Rainbows are colored because of the refraction of light." Marven replied.

"What is the refraction of light? Woo-woo-" the mayor asked again.

"This ......" Marven Ke couldn't answer the question.

If he had a science picture book at hand now, Marven might be able to explain it while flipping through the book, but it would not be easy for him to talk about refraction out of thin air.

The mayor saw Marven tilting his head and thinking about the answer, so he said to him, "Didn't your parents tell you?" The color of the rainbow in the sky was painted by the ancients with paint. ”

"Huh?" "Huh?" Marvin and Mia were surprised in unison.

Mayor Mab looked at Marven and Mia's expressions and said, "You really don't know?" Then I'll tell you. Woo-woo-"

Marven's question leads to a story that happened tens of thousands of years ago.

At that time, the Triangle Star was still a unified country, and everyone was both friendly and united together.

Life on a three-dimensional star is exactly the same as on Earth, except for a few differences – a three-cornered star has no color, only black and white.

The grass is white and the trees are black.

The house is white and the land is black.

The man is white and the garment is black.

The sun is white and the moon is black.

Of course, the black moon is invisible at night. It is only during the day that one can see a black disc or a black hook in the sky.

There are three moons. A moon hangs in the sky above each corner of the triangular star.

In addition to the black moon in the sky, there is also a black rainbow.

At that time, the rainbow was black.

One day, a bird flew from nowhere.

The bird is beautiful with blue feathers, red beak and claws, and yellow belly.

At this time, the people on the three-pointed star realized that in addition to black and white, there were red, blue, and yellow in this world.

The bird has a red seed in its beak and a blue seed and a yellow seed in its two paws.

When these seeds are planted in the soil, they grow into plants that can be used to make pigments.

People thought that the black rainbow was too ugly to hang in the sky, so they discussed painting it with color.

Those who like red want to paint the rainbow red. People who like blue and yellow want to paint their rainbows blue or yellow.

Just when everyone was in a lot of trouble, a dark cloud flew from nowhere, enveloping the three-cornered star.

The black rainbow and the black moon are no longer visible, only the white sun can be seen.