Briefly, Line Recognition

While calibrating military optics, Joseph Fraunhofer noted that the spectral lines, which specify elements to the amount of light their atoms emit or absorb; and the resulting wavelength, of the Sun differed from other stars.

Aldrich-Mees' lines appear horizontally along the nail bed after arsenic, thallium or other heavy metal poisoning or they may indicate renal failure.

Median incision begins along the linea alba, or white line, or the fusion of the aponeuroses of the abdomen, which separates the left and right rectus abominis muscles.

Where each phrase, clause or sentence corresponds to a line of poetry with a line break or caesura, enjambement delays the intention of the lines by "straddling" or "bestriding" them.

Conceivably, the Nazca lines of the Pampas de Jumana of Peru were made by removing the iron oxide rocks to expose the light earth underneath, and their longevity is owing to the relatively windless conditions of the desert there.

Ascenders and descenders categorize the Latin letters in the study of lineation, or typography.

Recognizing the line of sex role conflicts is tantamount to crossing it.

Djuna Barnes defines Nora of Nightwood as if the horizon line of day and night applies to soul metered by it:

"'Have I not shut my eyes with the added shutter of the night and put my hand out? And it's the same with girls,' he said, 'those who turn the day into night, the young, the drug addict, the profligate, the drunken and that most miserable, the lover who watches all night long in fear and anguish. These can never again live the life of the day. When one meets them at high noon they give off, as it were a protective emanation, something dark and muted. The light does not become them any longer. They begin to have an unrecorded look. It is as if they were being tried by the continual blows of an unseen adversary. They acquire an 'unwilling' set of features. They become old without reward, the widower bird sitting sighing at the turnstile of heaven, 'Hallelujah! I am sticked! Skoll! Skoll! I am dying!'"
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The concept of lines enters my language lately since I clearly enjoy crossing them. What if the barriers that initially titillate us in their impenetrability or by the insistence of transversal keep things interesting, for the lack of another word?