How to make sure humans do not know the meteorological phenomenon rainbow?

You've got to love the rainbow, it's an awesome sight. But I don't want humans to have the pleasure of seeing the rainbow.

What change to the earth, atmosphere and so on, is needed so that humans from approximately 2250 BC do not know of the existence of the rainbow?

Some more details:

• Human knowledge/technology between 2500 BC and 2000 BC.
• Preferably without affecting flora and fauna too much.
• I'm preferably looking for a change that does not affect the human body, such as the eyes (but I find answers exploring this option also intresting).
• Reality check based on the earth from about 2250 BC.
• Bonus: Preferably without changing the law's of nature, so it should in theory be possible to have this (reality-check).
• Bonus: Not only the rainbow, but also other ways of dispersing light should not be known/visible to humans (waterfall + sunlight).

I personally was thinking to change the atmosphere and fill it with lot's of water, so that all the light from stars or the sun is filtered before it reaches earth. But what would happen to plants and animals in this case?

posted over 6 years ago

Rolf ツ‭

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