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Colours |
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| The blue sky |
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| The phenomena of colour vision: Why does the sky
appear blue on a cloudless day and why is the sun red in the evening?
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| A rainbow |
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| How is a rainbow created? Read how nature creates a
show of colour in the sky.
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| Benham's disc |
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| Colour in the spaces! The rotating black and white
disc creates colour impressions.
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