noun: a dominating and pervasive presence ("He received little recognition working in the shadow of his father")
noun: an unilluminated area
noun: something existing in perception only

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Keely
Dimensional or Inter-Dimensional Beings
"There is much atmospheric celestial material that has never been revealed to man's senses. Attenuated elements extend to infinite reaches beyond hydrogen, including actual substances or compounds which have never been revealed to our senses. Beings fashioned of these substances could walk by our sides unseen and cast no shadow in the noonday sun." [Keely, The Operation of the Vibratory Circuit, The Connecting Link Between Mind and Matter - Keelys Progress - Part 2]