Phi Ruler
TAT-PHI-PK-HC-BLK-GLD
HK$460
A special edition notebook designed around the golden ratio — φ, 1.618. In collaboration with Hong Kong designer Yat Ming, pages carry custom grid lines calibrated to φ itself, designed to work alongside the Phi Ruler as a complete sketching kit.
Size
A6+ Pocket
Cover
Hardcover
Color
Black
Ruling
Specification
- Pocket Size (A6+) - 88 x 145 mm | 140 g
- 80 gsm FSC®-certified acid-free paper
- Golden Ratio Grid
- 188 Numbered Pages with Index
- Hardcover
- TATOU® 2-layer Inner Pocket
- Elastic Closure Band
- Dual Bookmarks
- 180° Lay-flat Sewn Perfect Binding
Fountain Pen Friendly
Smooth, ink-ready pages designed to minimize bleed-through and feathering.
Premium Writing Paper
Carefully selected FSC® paper for clean lines, comfortable writing, and consistent ink performance on every page.
Sustainability Promise
Made to last, responsibly sourced, thoughtfully produced.
Designed in Hong Kong
Crafted with global perspective, made for minds everywhere.
Global Delivery
From our studio to your doorstep, across cities and continents.