A summer hokku:
Leaves suddenly appear
On the paper screen.
This too is a verse requiring a small intuitive leap. Why would leaves suddenly appear on a paper screen? Because the sun has just risen, casting shadows of plants onto the east side of the screen; and the observer is behind the screen, and sees them as they suddenly appear, dark silhouettes on the paper, surrounded by translucent light.
That of course uses “harmony of contrast” — the bright Yang light of the rising sun, and the Yin shadows cast on the Yang white paper screen.