idiom.
Tackling a particularly messy, and probably impossible, problem.
Example Citation:
How do you measure happiness, anyway? Happiness, like pain, has a threshold that varies from person to person. Defining it is about as easy as nailing jelly to a tree.
Lyndall Crisp, "Consumed By Unhappiness," Australian Financial Review, June 30, 2001
Lyndall Crisp, "Consumed By Unhappiness," Australian Financial Review, June 30, 2001
Notes:
The originator of this phrase may have been psychologist Jerry Willis, who published a book called Nailing Jelly to a Tree in 1981. This book's title is mentioned in several articles after that (including William Safire's "On Language" column in The New York Times). Here's the first media citation I could find that uses the phrase without reference to the book:
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