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Since the main character is red, I chose green – the complementary colour – for the pigs, who have stolen the birds’ eggs and are sheltering in the structures.

If we deduct the last measures from the first, the difference of aperture will give the complementary colour.

Where these lines cut the circumference is placed the complementary colour.

Now the same complementary colour will be found for both, but if we were to use the bright complementary colour which we obtained with the orange for the brown, and endeavoured to obtain a white with it by means of the double-image prism we should fail, as the complementary colour would predominate.

Like the colour itself, the complementary colour can always be expressed either by a single ray of the spectrum, or by white light from which a single ray is deducted.