Attributions
- "Chambered Nautilus Shell - detail" by Jitze Couperus (https://www.flickr.com/photos/jitze1942/3114723951) -- Licensed by CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) -- Image scaled up, cropping edges
- "Gears" by Joe deSousa (https://www.flickr.com/photos/mustangjoe/22711070429) -- Licensed by CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/) -- Image scaled up, cropping edges