But the internet did what it does best—and solved the mystery.

Answer: They’re photo corners.

These small paper triangles are designed to hold photos, cards, or other items securely on the pages of a scrapbook or notebook without damaging them. You simply slide the corners of a photo into these little pockets and stick them onto a page. No glue. No tape. Just clean, archival-friendly placement—perfect for preserving memories.

So while the handmade notebook was already charming, it turned out to be a hidden treasure trove for scrapbookers and journalers. The photo corners weren’t just decoration; they were a functional, thoughtful bonus for anyone looking to create a keepsake that lasts.