• UI Apple Design Resources: https://developer.apple.com/design/resources/
• Photoshop Kasper Hviid, Water Color: http://the-missing-ink.org/
• Procreate Analog Color palette: https://sellfy.com/p/f4c7

• Apple Human Interface Guidelines
  • Do and Don't
  • Video lectures
• Google Material Design Guidelines
  • Responsive Layout
  • Android Icon
• Tog from Apple, Inc: https://asktog.com/atc/principles-of-interaction-design/
  
  
• Guide to DPI
• Adobe 4 golden rules of UI design
• Object Oriented UI design
• Fitts's Law Larger button is not always better. Longer moving distance could cost users more time and focus.
  
  
• Lab Color Space介绍，以及如何使用Lab色彩空间快速调整特定颜色 https://www.youtube.com/watch?v=bBh3DE2OIOw&feature=youtu.be&t=24m19s
  
• What is Lab color: http://www.photoshopbuzz.com/what-is-lab-color-photoshop/
  
• Human Eye Cell Color Spectrum: https://midimagic.sgc-hosting.com/huvision.htm
• Simulate Color Vision Defects Light Source: https://midimagic.sgc-hosting.com/visospec.htm#cbsim
• Defective Color Vision And Traffic Signals: https://midimagic.sgc-hosting.com/sigvison.htm
• Human's eye can see only a very small region (fovea area): https://www.shadertoy.com/view/4dsXzM
• How to Write a Paper in a Weekend (By Prof. Pete Carr): https://youtu.be/UY7sVKJPTMA

- 不気味の谷現象