Rainbow Color-Coded Bookshelf — Postcard

Books stacked strictly by spine color — hot pink and red, then navy and blue, then gold and orange — turn a plain white bookcase into a rainbow gradient. It's the shelf every color-sorter secretly wants.

A graphic, punchy postcard for a design-minded pen pal or a shelfie lover's collection.

• Density: 350 g/m²
• Size: 10×15 cm