shadow


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shadow

1. the dark portions of a picture
2. Med a dark area on an X-ray film representing an opaque structure or part
3. (in Jungian psychology) the archetype that represents man's animal ancestors
4. Brit designating a member or members of the main opposition party in Parliament who would hold ministerial office if their party were in power

Shadow

A region of darkness caused by the presence of an opaque object interposed between such a region and a source of light. A shadow can be totally dark only in that part called the umbra, in which all parts of the source are screened off. With a point source, the entire shadow consists of an umbra, since there can be no region in which only part of the source is eclipsed. If the source has an appreciable extent, however, there exists a transition surrounding the umbra, called the penumbra, which is illuminated by only part of the source. Depending on what fraction of the source is exposed, the illumination in the penumbra varies from zero at the edge of the full shadow to the maximum where the entire source is exposed. The edge of the umbra is not perfectly sharp, even with an ideal point source, because of the wave character of light. See Diffraction

What does it mean when you dream about a shadow?

A shadow may represent the hidden aspects of the self. The dreamer often does not accept these parts of his or her personality and they are projected upon others until the dreamer can accept them and incorporate them into his or her psyche.


What does it mean when you dream about a shadow?

In psychology, the shadow refers to the personality traits and tendencies that one has rejected in developing one’s self-image. One of the most influential formulations of the shadow was put forward by the famous Swiss psychiatrist Carl Jung. In Jung’s personality theory, the ego represents the individual’s sense of personal self. This sense of personal identity is purchased at the expense of certain tendencies (e.g., socially undesirable traits), however, which are rejected as “not-self.” According to Jung, these rejected traits come together as a kind of unconscious “counterego” that he termed the shadow.

Although suppressed from conscious awareness, the shadow continues to influence our behavior in powerful ways. In particular, we may become unduly anxious or irritated when in an environment or around a person that in some way reminds us of repressed aspects of our self. If a person has rejected his or her own sexual drive, for example, that person may feel irrational fear or anger around an overtly sexual individual. The shadow may appear as a person in one’s dreams, usually as an individual of the same sex. In Jungian therapy, the shadow is viewed as a potential source of characteristics to be integrated into the subject’s ego structure.

shadow

[′shad·ō]
(optics)
A region of darkness caused by the presence of an opaque object interposed between such a region and a source of light.
(physics)
A region which some type of radiation, such as sound or x-rays, does not reach because of the presence of an object, which the radiation cannot penetrate, interposed between the region and the source of radiation.

SHADOW

(language)
A syntax-directed compiler written by Barnett and Futrelle in 1962. It was the predecessor to SNOBOL(?)

[Sammet 1969, p. 448, 605].
References in classic literature ?
Yes, I will tell you all about it," said the shadow, and sat down: "but then you must also promise me, that, wherever you may meet me, you will never say to anyone here in the town that I have been your shadow.
A word is a shadow," said the shadow, "and as such it must speak.
It was dressed entirely in black, and of the very finest cloth; it had patent leather boots, and a hat that could be folded together, so that it was bare crown and brim; not to speak of what we already know it had--seals, gold neck-chain, and diamond rings; yes, the shadow was well-dressed, and it was just that which made it quite a man.
Now this was perhaps from arrogance; and the shadow on the ground kept itself so still and quiet, that it might hear all that passed: it wished to know how it could get free, and work its way up, so as to become its own master.
The river led me a short distance within the shadow before it emptied into the Sojar Az.
Of course," I continued, "you cannot escape your shadow, but that was to be expected.
To make sure, I looked for his shadow, and there it was, a shapeless blotch the girth of his body, (the sun was overhead), moving along the ground.
I saw the dark blotch move swiftly across the court, and a brilliant burst of vari-colored light moving with equal swiftness to meet it; and then shadow and flash came together and there was the sound of unseen blows.
And always two long black shadows flitted before us or followed after, dark spots on the ruddy grass.
Will he not fancy that the shadows which he formerly saw are truer than the objects which are now shown to him?
And first he will see the shadows best, next the reflections of men and other objects in the water, and then the objects themselves; then he will gaze upon the light of the moon and the stars and the spangled heaven; and he will see the sky and the stars by night better than the sun or the light of the sun by day?
And if they were in the habit of conferring honours among themselves on those who were quickest to observe the passing shadows and to remark which of them went before, and which followed after, and which were together; and who were therefore best able to draw conclusions as to the future, do you think that he would care for such honours and glories, or envy the possessors of them?