 Nevertheless, lighting of the navigational twilight is not enough for normal human activity, so the streets need artificial illumination, and it is believed that there are no so-called white nights in Moscow, although the sky remains dark blue, and not black, as, for example, in southern Russia.Top-left lighting

Top-left lighting is an artistic convention in which illustrations are produced so that the light appears to come from the top left of the picture.The vertical element of the convention comes from the human intuition that sunlight comes from above.