A Treatise on Painting
by Leonardo da Vinci, translated by John Francis Rigaud
Effect of the Mind upon the Motions of the Body, occasioned by some outward Object
4004405A Treatise on Painting — Effect of the Mind upon the Motions of the Body, occasioned by some outward ObjectJohn Francis RigaudLeonardo da Vinci

Chap. CXI.Effect of the Mind upon the Motions of the Body, occasioned by some outward Object.

When the motion is produced by the presence of some object, either the cause is immediate or not. If it be immediate, the figure will first turn towards it the organs most necessary, the eyes; leaving its feet in the same place; and will only move the thighs, hips, and knees a little towards the same side, to which the eyes are directed.