Light and shadow create each other. Maybe, the statement is wrong, however, without shadow, we cannot recognize light. In the sense shadow create vision of light to our eyes.
"Under heaven all can see beauty only there is ugliness.
All can know good as good only because there is evil.
Therefore having and not having arise together;
Difficult and easy complement each other;
Long and short contrast each other;
Voice and sound harmonize each other;
Front and back follow each other.
Therefore the wise go about doing nothing, teaching no-talking.
The ten thousand things rise and fall without cease,
Creating, yet not taking credit.
Work is done, then forgotten.
Therefore it lasts forever.
TAO TE CHING"