A dark object seen against a bright background will appear smaller than it is. A light object will look larger when it is seen against a background darker than itself.
Leonardo da Vinci
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A shadow will appear dark in proportion to the brilliancy of the light surrounding it and conversely it will be less conspicuous where it is seen against a darker background.
Leonardo da Vinci
The body which is nearest to the light casts the largest shadow, and why? If an object placed in front of a single light is very close to it you will see that it casts a very large shadow on the opposite wall, and the farther you remove the object from the light the smaller will the image of the shadow become.
Leonardo da Vinci
Now, since the time of Newton there had been a debate about whether light was a wave---that is, a traveling disturbance in some background medium---or a particle, which travels regardless of the presence of a background medium. The observation of Maxwell that electromagnetic waves must exist and that their speed was identical to that of light ended the debate: light was an electromagnetic wave.
Lawrence M. Krauss
The eye which turns from a white object in the light of the sun and goes into a less fully lighted place will see everything as dark.
Leonardo da Vinci
In the depths of the mirror the evening landscape moved by, the mirror and the reflected figures like motion pictures superimposed one on the other. The figures and the background were unrelated, and yet the figures, transparent and intangible, and the background, dim in the gathering darkness, melted into a sort of symbolic world not of this world. Particularly when a light out in the mountains shone in the center of the girl's face, Shimamura felt his chest rise at the inexpressible beauty of it.
Yasunari Kawabata
Vinci, Leonardo da
Vine, Stella
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