penumbras

Edges of shadows

Penumbras is the plural of penumbra, the partial shadow surrounding the complete shadow (umbra) cast by an object blocking light.

During an eclipse, the penumbra is the zone of partial obscuration.

Figuratively, a penumbra is a surrounding area of uncertainty or ambiguity: the penumbras of constitutional rights, operating in the penumbra between legal and illegal.

figurative

margins

Edges of a page

periphery · fringe · borderland · uncertainty · liminal · threshold · twilight · indistinct · blurred · vagueness

astronomical

shadow

Light blocked by object

partial · totality · corona · occultation · transit · sunspot · darkness · celestial · moon · sun

artistic

chiaroscuro

Contrast technique in painting

  • shadingDepicting light and darkness
  • gradationIncremental transition between stages
  • shadowLight blocked by object

tone · contrast · halftone · value · rendering · depth · atmosphere · dimness · softness · light

legal

implied

Suggested without stating

privacy · Griswold · amendments · doctrine · interpretation · zones · liberties · Bill of Rights · jurisprudence · inferred

Categories
Opposites
light intensity/shadow depth

penumbrasumbras

Darkest shadow portions

brilliance · radiance · direct sunlight · glare · spotlight

definitional clarity

penumbrassharp edges

hard lines · clean breaks

conceptual/legal clarity

penumbrasenumerated powers

Authorities explicitly granted by constitution

plain meaning · textualism

Family

penumbra, penumbral

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