Around 1980 Dr. Robert Plutchik invented "The Feelings Wheel" which was designed to help patients identify their feelings and where they stem from.
For example you can use the wheel to identify:
1.) "I am angry"
2.) "Specifically I feel let down"
3.) "I am resentful"
I like this wheel because it's useful at finding the right words to describe feelings, but also its interesting "circle shape" conveys sooooo much information in one image.
I posted this on Twitter, and Kamphey the Google Sheets Wizard re-made this into a Google Spreadsheet!
That's the cool thing about Twitter....you share ideas, and mash-ups of them happen so quickly. Neat!