Ammonite fossil from Madagascar Nov 23, 2025

Ammonite fossil from Madagascar

Look closely at this ammonite fossil. Its swirling shell, once home to a prehistoric sea creature, holds a mathematical secret—a spiral pattern. Each new chamber is proportionally larger than the previous one, maintaining a consistent growth ratio, often associated with the Fibonacci sequence.

© ThomasLENNE/Shutterstock

palette

Today in History

Nov 23, 2023Teide National Park, Tenerife, Canary Islands
Nov 23, 2024Spiral aloe, Kangaroo Island, Australia

More Desktop Wallpapers:

May 25, 2025Butchart Gardens in Brentwood Bay, British Columbia, Canada
Sep 16, 2025Nighttime view over the Gulf Coast
Dec 27, 2024Lake Bled, Slovenia
Jun 9, 2025Old City of Dubrovnik in Dalmatia, Croatia
Mar 12, 2024Bryce Canyon National Park, Utah, USA
Jun 27, 2024Duomo Santa Maria del Fiore, Florence
Aug 17, 2024Alfanzina lighthouse, Algarve, Portugal
Aug 22, 2023Amphitheatre of El Jem, Tunisia
Sep 23, 2024Sea otter, Alaska, USA
Aug 10, 2024Joshua Tree National Park, California, USA
May 23, 2025Yellow-spotted river turtle, Amazon Region, Ecuador
Feb 22, 2024Bathing boxes at Brighton Beach, Australia
Mar 16, 2024Eurasian blue tit, United Kingdom
Nov 1, 2023Haut-Barr Castle, Vosges, France
Feb 21, 2024Horsetail Fall, Yosemite National Park, California, USA
Oct 31, 2025Bran Castle in Bran, Brașov, Romania
Dec 22, 2023Castlerigg Stone Circle, Cumbria, United Kingdom
Feb 26, 2025Castle Stalker, Argyll, Scotland
Sep 21, 2023Inside the Nobel Peace Centre, Oslo, Norway
May 27, 2024Baia del Silenzio in Sestri Levante, Italy
Aug 1, 2025Royal Mile, Edinburgh, Scotland
Feb 23, 2024Haghartsin Monastery, Armenia
Nov 24, 2025Gwalior Fort, Madhya Pradesh, India
Mar 20, 2024Peveril Castle, Derbyshire, England
Jan 27, 2024Spot-billed toucanet, Brazil
Aug 3, 2024Three Natural Bridges, Wulong National Park, China
Sep 28, 2023Container ship near a commercial port in Thailand
Jul 21, 2025Staghorn coral in shallow ocean
Aug 6, 2024Molokini crater, Maui, Hawaii, USA
Mar 19, 2024Tree frog on leaf