Concerning Indivisible Lines (Greek: ΠΕΡΙ ΑΤΟΜΩΝ ΓΡΑΜΜΩΝ; Latin: De Lineis Insecabilibus) is attributed to Aristotle but may have had another author. 

Translated by Harold H. Joachim. 

Painting: Ascent of the Blessed by Hieronymus Bosch, c.1515.

Recording and cover design by Geoffrey Edwards are in the public domain.