Also called: Lines on the second phalange of the thumb · Signs on the reason section

Where on the hand: On the middle (logic) phalange of the thumb.

What it looks like: Fine vertical lines along the section, horizontal bars crossing it, small circles, a triangle, or a crosshatched mesh.

Marks here modify reasoning quality. Vertical lines strengthen logic; horizontal lines corrupt it into sophistry; a triangle gives scientific aptitude; a grille is the worst finding.

Read with care: "Poor character; potential dishonesty" is a strong moral verdict on a common skin pattern; report as tradition.