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An oblique case can appear in any case relationship except the nominative case of a sentence subject or the vocative case of direct address.
In ergative-absolutive languages, the absolutive case is used for a direct object (the subject will then be in the ergative case); but the absolutive case is also used for the subject of an intransitive verb, where the subject is being passively described, rather than performing an action.
Oblique cases appear in the English pronoun set; these pronouns are often called objective pronouns.
Oblique illumination is achieved by means of a sliding diaphragm that shields the center of the light beam to produce a partially coherent light source, which is projected obliquely onto the specimen, producing a high contrast image.
Oblique illumination is similar in many aspects to the darkfield technique except that, instead of the specimen being lighted from all directions at obliqueangles, light is projected from only a single azimuth.
Oblique illumination is generally achieved by placing a slit or sector stop beneath the lower lens and aperture diaphragm of the condenser, allowing only oblique light passing through the narrow opening of the stop to illuminate the specimen.
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