But it went away again when I stopped moving my head. I tried it again, only sober this time, and noted the same effect. Shadowlight is a form of light which exists at very small wavelengths, far beyond the visible spectrum. Thus, dark can be seen flowing out of the side of objects facing away from the light source.
Transparent objects contain a much lower dark density, and thus produce weaker shadows.
It is thought that if Newton was aware of the way in which solar Shadowlight accelerates dark, which in turn applies a downward force to solid objects, our concept of gravity would be quite different. The slight friction between dark particles and water particles pushes the water. This moving water in turn pushes the water that lies further down out of sight of the mountains, until it flows out into the sea. Test this for yourself - as you move an object further from its shadow, the shadow spreads out and gets fuzzier and fainter. This is because the cone-shaped flow of dark is being spread out over a larger area, and is therefore diluted by more light.