E Euclid System
PROP. I.

Euclid's visible proof system.

A design system drawn from color-coded propositions, old-style book pages, ornamental initials, heavy circles, proof marks, and construction lines.

npx skills add mrjf/euclid-design-skill
Drawn Euclid proof plate with colored circle theorem and proposition text T HE straight line drawn from the point of contact falls without the circle. And if any straight line be drawn, to the point of contact, it cuts the circle. PART I
PROP. II.
T

he straight line drawn from the extremity of the diameter of a circle perpendicular to it, falls without the circle. Geometry becomes legible when propositions are not merely named, but colored, placed, and repeated.

PROP. III.

Poster Plate

One proposition, one page.

BOOK III. PROP. XXV. PROB.

Describe the circle from the segment.

Q. E. D.
Segment given Perpendiculars drawn Centre found
PROP. IV.

Tokens

Color, line, figure, proof.

Token Value Use
Euclid Blue #0E558A Circles, principal arcs, measured equality
Vermilion Red #C43C35 Contradiction, alternate line, acute angle
Proof Ochre #E4A412 Base line, tangent, known construction
Ink Black #191816 Text, theorem line, final relation
Page Cream #EFE2C9 Ground, panels, book leaf
blue red ochre ink paper
PROP. V.

Components

Objects of proof.

I

Line phrase

A sentence can carry geometry inside it: draw and bisect them.

II

Dashed construction

Use or for lines assumed, extended, or disproved.

III

Angle chip

Filled sectors replace labels and make equivalence visible before the reader reaches the equation.

PROP. VI.

Archive

Browse the proof system.

Collection / Book III
Prop. XVI Tangent without the circle Prop. XXV Describe the circle from a segment Prop. XXVI Equal angles stand on equal arcs
PROP. VII.

Type

Old-style serif, proof-scale rhythm.

Display · 76px

Book III.

Heading · 46px

Proposition and theorem.

Body · 20px

The page voice is literary and mathematical: compact capitals, italic captions, generous leading, and equations embedded in prose.

Proof Mono blue = red = dotted relation;
PROP. VIII.

Form

Construct a theorem card.

Registration

Fields inherit the same thick ink rules and paper surface as the diagrams.

PROP. IX.

Responsive

Single leaf to open spread.

320+One proof column. Figures stack below theorem text.
720+Two-page spread. Diagram and prose sit as facing leaves.
1080+Wide theorem plate. Marginalia, tokens, and proofs align on a ruled grid.
PROP. X.

Install

One command. Every proposition.

npx skills add mrjf/euclid-design-skill

Colored notation · Heavy geometry · Dashed construction · Book-paper interface