When comparing solutions born from necessity versus those born from play, what outcome is associated specifically with necessity?

The solution must be functional.

The distinction between creation driven by necessity and creation driven by play lies in the required outcome. When necessity dictates the path, the resulting solution is strictly bound by the requirement that it must be functional; it must solve the immediate, pressing problem effectively. Conversely, when play is involved, the creative freedom allows for the development of solutions that prioritize novelty, perhaps serving no immediate practical payoff, or exploring avenues purely for the sake of discovery. Therefore, necessity imposes a standard of mandatory utility, ensuring the invention serves its purpose, whereas play allows for more abstract or non-essential explorations.