Fox and the Grapes
A downward-sloping line graphs Aesop's sour-grapes fox: the less reachable the grapes, the more desirable.
Use this cartoon
Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2018-03-30-fox-and-the-grapes/ (CC BY-NC 4.0)Transcript
[Graph: desirability of grapes (y) vs. accessibility of grapes (x), decreasing line]
Fox: "Stupid fruit-marbles. Probably poison anyway."