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Wikimedia Commons · Public domain · Hover to magnify, click for fullscreen
Original fileThe print displays a mathematical spiral expanding from a central point, with a specific point on the curve labeled 'a'. Above the diagram is a block of Early New High German text in Fraktur script, explaining the construction of the curve using a compass and proportional division. The illustration demonstrates the concept of a line that continues infinitely both inward toward a center and outward into space.
This work is from Dürer's 1525 'Underweysung der Messung' (Manual of Measurement), which introduced Euclidean geometry to the German-speaking artistic world. The 'eternal line' reflects the Renaissance preoccupation with the mathematical harmony of the cosmos and the relationship between finite human perception and infinite geometric ideals.
Es mag ein ewige lini erdacht werden / die da stettiglich zu eim Centrum eynwarts / auch an dem andern teyl in die weyten vber einander laufft / vñ nymer mehr zu keym end kombt / Di se lini kan man mit der hand der vnentlichen grosse vnd kleine halben nit machen / Dann jr anfang vnd end so sie nit sind / ist es nit zu finden / das fast allein der verstand / Aber ich will sie vnden mit eim anfang vñ end / so vil dañ müglich ist anzeigen / Ich heb an bey eim punckten . a. vñ zeüch dise lini zirckelsweis hynein / als solt sie zu eim Centru lauffen / vñ so offt sie in eynander laufft / brich ich der weiten zwischen der lini ein halbteil ab / des gleichẽ thů ich / so ich mit der lini vom . a. herauß lauff / so offt ich mit jr vber eynander lauff / so offt gib ich der lini eyn halbteyl zu / von der weyten / Also laufft dise lini ye lenger ye enger hynein / vnnd lenger ye weyter herauß / vnnd kumbt doch nymer meer zu keim ende / weder hynein noch herauß wie ich das zůuerstehen hie vnden hab auffgerissen. 27 a
Translation
An eternal line may be imagined, which steadily runs inward toward a center, and on the other side runs outward into the distance, overlapping itself, and never reaches an end. This line cannot be drawn by hand because of its infinite size and smallness, for since it has no beginning or end, it cannot be found, but exists almost solely in the understanding. However, I will show it below with a beginning and an end, as far as that is possible. I begin at a point 'a' and draw this line in a circular motion inward, as if it were running to a center, and as often as it overlaps itself, I break off half of the width between the lines; I do the same when I run outward from 'a', and as often as I overlap, I add half the width to the line. Thus, this line runs ever longer and narrower inward, and longer and wider outward, and yet never reaches an end, neither inward nor outward, as I have illustrated below for its understanding. 27 a
Albrecht Dürer, Underweysung der Messung (1525)
This diagram is a primary illustration from Dürer's textbook on the application of geometry to the arts.
Object
Engraving
scientific
Digital Source
Wikimedia Commons · Public domain
Vnderweysung der messung mit dem Zirckel vnd richtscheyt, in Linien ebnen und gantzen corporen
Public domain
1994 × 1297 px
e5d94594031dbe1f4a768c3be5a059523912a57b
April 10, 2021
March 24, 2026
Linked Data
AI AI-cataloged fields generated by gemini-3-flash-preview on April 1, 2026. Getty identifiers are AI-inferred and may require verification.