United States Copyright Office Circular21 publication on Fair Use: copyright.gov/circs/circ21.pdf

global
alien outlook
circles
  • originally created in Adobe Illustrator®
computer keys
  • originally created in Adobe Illustrator®
flag
  • originally created in Adobe Illustrator®
  • information on flag dimensions from: ushistory.org
fried egg
  • originally created and adapted in Adobe Illustrator®
  • original image from: vecteezy.com
memory manager
pumpkin pie
similar earths?
  • source image from: earth map
  • source image from: moon
  • original enhancements
sofa
twilight
  • originally imagined and created in Adobe Illustrator®
  • moon image from: universetoday.com
  • grass adapted from: shutterstock.com
  • clouds extracted in Adobe Photoshop® from: vecteezy.com 
  • stars created and randomized with the ai extension Randomill®
  • originally created and enhanced
yin yang