The drawing
The drawing is a set of signs, points, strokes and hatches of different densities that organize a flat surface.

Luca Cambiaso (1527 – 1585)
A mental image
The stroke, at the base of the drawing, is a simplification, a transposition of a visual or mental image onto a two-dimensional space.
There is no defined line in nature
The outside world appears as a juxtaposition of surfaces and colors, only the outlines of the objects seem to form lines that in reality do not exist.
“Un’apparente dimostrazione con linee di quelle cose, che prima l’uomo con l’animo si aveva concepite, e nell’idea immaginate; al che s’avvezza la mano con lunga pratica, ad effetto di far con quello esse cose comparire”.
Filippo Baldinucci, 1681