utility

Brand Assets & Guidelines

The πρ mark, wordmark lockups, social headers, and visual guidelines for press, collaborators, and institutional partners.

The mark
Greek letters π (upright serif) and ρ (italic serif) in deep navy inside a rounded-square frame on white.
Download
SVG for web, PNG for raster use, print-ready K-only black for book interiors, CMYK coming post-launch.
Color
Canonical navy #163e64 (Source Serif 4 glyphs). Matches the site's accent token across every surface.

The πρ mark

The Panta Rhei brand mark is two Greek glyphs — π (pi, upright) and ρ (rho, italic) — set in Source Serif 4, in deep navy, inside a rounded-square black-stroked frame on white. The glyphs sit diagonally: π upper-left, ρ lower-right, with the ρ’s descender reaching below the π baseline.

The mark references Panta Rhei’s two foundational operators: π (the fundamental constant entering the master ratio ι_τ = 2/(π+e)) and ρ (the progression operator — the only generative act in the framework). These aren’t decorative letters. They’re the program’s two most load-bearing symbols, typeset as identity.

Panta Rhei πρ mark

Download the assets

Primary mark

SVG (light, canonical) PNG 1200 (light) SVG (dark variant)

Glyph only (no frame)

SVG PNG 512 Print (K-only black) Mono white

Wordmark lockups

Horizontal SVG Stacked SVG

Social media

Header light (1500×500) Header dark (1500×500) Profile light (400×400) Profile dark (400×400) OG image (1200×630)

Email signature

Email PNG (120×120)

Color palette

Role Hex Usage
Brand navy #163e64 Glyphs, buttons, links, chip accents. Canonical across logo + site UI.
Brand accent soft rgba(22, 62, 100, 0.12) Button backgrounds, chip hovers, subtle tints.
Site background #f6f7f3 Warm off-white, page canvas.
Site secondary bg #eef1eb Section fills.
Text primary #182027 Body text, headings.
Text muted #5b6772 Metadata, captions, supporting text.
Frame black #000000 Logo frame stroke only. Do not use for body text.

Typography

  • Logo glyphs: Source Serif 4 — Regular for π (upright), Italic for ρ.
  • Display (headings, wordmark): Iowan Old Style → Palatino → Palatino Linotype → Book Antiqua → Georgia → serif.
  • UI / body: Inter (self-hosted, variable font, font-display: swap).
  • Mono (code, identifiers): SF Mono → Fira Code → JetBrains Mono → Consolas.

Clear space & sizing

  • Clear space: minimum padding around the framed mark equals 1× the glyph height. Don’t crowd with other elements.
  • Minimum display size: framed mark ≥ 24 px; glyph-only ≥ 16 px. Below these sizes, readability of the ρ descender degrades.
  • Do not resize non-uniformly. Always scale proportionally.

Do

  • Use the primary mark (navy glyphs + black frame on white) in 90% of contexts.
  • Use the dark variant for navy/black backgrounds.
  • Use the glyph-only variant in tight UI contexts (site header, email signatures).
  • Use the print K-only variant for book interiors, invoices, business cards.
  • Pair the mark with Iowan Old Style / Palatino for wordmarks, Inter for supporting text.

Don’t

  • Don’t recolor the glyphs outside the approved palette.
  • Don’t tilt, stretch, or skew the mark.
  • Don’t add drop shadows, glows, or effects.
  • Don’t swap π or ρ for other Greek letters.
  • Don’t use a different frame ratio (always 1:1 rounded square).
  • Don’t place the mark over busy photographic backgrounds without the frame.

File format decision tree

Context Format
Web (site, social, email) SVG preferred; PNG for platforms that reject SVG
Print interior (book, card, letter) logo-print-k.svg (pure black vector)
Social header PNG 1500×500 (platforms require raster)
Favicon SVG + PNG fallbacks (see assets/favicon.svg + assets/favicon-*.png)
Email signature PNG 120×120 (email clients strip SVG)

Voice & platform copy

For writers, journalists, collaborators, and anyone needing on-brand copy to paste into a platform profile or press release: see the separate Voice & Platform Copy document. It contains:

  • Three canonical voices (Program, Thor, Anna-Sophie) × three lengths (1-liner / 3-liner / 1-paragraph)
  • Paste-ready profile copy for LinkedIn, X, Mastodon, Bluesky, Amazon, ORCID
  • Hashtag discipline and link conventions
  • Boilerplate paragraphs and program description

License

The mark, wordmark, and all derivative assets in this brand kit are © 2026 Thorsten Fuchs & Anna-Sophie Fuchs and are made available for editorial, journalistic, and academic use under the site’s CC BY 4.0 license. Attribution: “Panta Rhei Research Program, panta-rhei.site”.

For commercial licensing, co-branding, or derivative works beyond editorial use, please contact [email protected].

Questions

Brand questions, press inquiries with asset needs, or requests for additional formats: [email protected].