“Originally, feathers evolved to retain heat; later, they were repurposed for a means of flight. No one ever accuses the descendants of ancient birds of plagiarism for taking heat-retaining feathers and modifying them into wings for flight. In our current system, the original feathers would be copyrighted, and upstart birds would get sued for stealing the feathers for a different use. Almost all famous discoveries (by Edison, Darwin, Einstein, et al.) were not lightning-bolt epiphanies but were built slowly over time and heavily dependent on the intellectual superstructure of what had come before them.”

From: Life is Short; Art is Shorter, by David Shields