A Treatise on Painting
by Leonardo da Vinci, translated by John Francis Rigaud
Of the Joints of the Fingers
3999127A Treatise on Painting — Of the Joints of the FingersJohn Francis RigaudLeonardo da Vinci

Chap. XXXV.Of the Joints of the Fingers.

The joints of the fingers appear larger on all sides when they bend; the more they bend the larger they appear. The contrary is the case when straight. It is the same in the toes, and it will be more perceptible in proportion to their fleshiness.