Season imagery sources (Wikimedia Commons)

spring.webp — Green spring landscape.jpg, Neal Floyd, public domain
https://commons.wikimedia.org/wiki/File:Green_spring_landscape.jpg

summer.webp — Fields landscape summer.jpg, Steve Hillebrand / U.S. Fish and Wildlife Service, public domain
https://commons.wikimedia.org/wiki/File:Fields_landscape_summer.jpg

autumn.webp — Fall foliage (16a4461e-58a0-4bdc-b319-203839872891).jpg, NPS / Diane Renkin, U.S. federal government public domain
https://commons.wikimedia.org/wiki/File:Fall_foliage_(16a4461e-58a0-4bdc-b319-203839872891).jpg

winter.webp — Snow landscape.jpg, released into the public domain by the copyright holder
https://commons.wikimedia.org/wiki/File:Snow_landscape.jpg

Local copies were resized and converted to WebP for web delivery.