And it is that shadow which is the real secret of the magic of moonlight. The shadows of the day have beauty but no secrecy. The sunlight is too strong to be wholly or even very materially denied. Even its shadows are luminous and full of colour, and the contrast between light and shade is not the contrast between the visible and the invisible, between the light and the dark: it is only a contrast between degrees of brightness. Everything is bright, but some things are more bright than others. But in the moonlight the world is etched in black and white. The shadows are flat and unrevealing. They have none of the colour values produced by the reflected lights in the shadows of the day. They are as secret as the grave; distinct personalities, sharply figured against the encompassing light, not mere passages of colour tuned to a lower key. And the quality of the encompassing light itself emphasises the contrast. The moon does not bring out the colour of things, but touches them with a glacial pallor:
.... Strange she is, and secret.
Strange her eyes; her cheeks are cold as cold sea-shells.
See the moonlight fall upon your house-front and mark the wonderful effect of black and white that it creates. Under the play of the moonbeams it becomes a house of mysteries. The lights seem lighter than by day, but that is only because the darks are so much darker. That shadow cast by the gable makes a blackness in which anything may lurk, and it is the secrecy of the shadow in a world of light that is the soul of romance.
Take a walk in the woods in the bright moonlight over the tracks that you think you could follow blindfold, and you will marvel at the tricks which those black shadows of the trees can play with the most familiar scenes. Keats, who was as much of a moonlighter in spirit as Scott, knew those impenetrable shadows well:
.... tender is the night,
And haply the Queen-moon is on her throne,
Cluster'd around by all her starry Fays;
But here there is no light,
Save what from heaven is with the breezes blown
Through verdurous glooms and winding mossy ways.
In this moonlight world you may skip at will from the known to the unknown, have publicity on one side of the way and secrecy on the other, walk in the light to see Jessica's face, and in the shadow to escape the prying eyes of Shylock. Hence through all time it has been the elysium of lovers, and "Astarte, queen of heaven, with crescent horns," has been the goddess whom they serve,
To whose bright image nightly by the moon,
Sidonian virgins paid their vows and songs.
Perhaps it is the eternal lover in us that responds so unfailingly to the magic of the moonlight.