Ideas are commonly described using metaphors; a bright idea appears like a "light bulb'' or the "seed'' of an idea takes root. However, little is known about how these metaphors may shape beliefs about ideas or the role of effort versus genius in their creation, an important omission given the known motivational consequences of such beliefs. We explore whether the light bulb metaphor, although widespread and intuitively appealing, may foster the belief that innovative ideas are exceptional occurrences that appear suddenly and effortlessly-inferences that may be particularly compatible with gendered stereotypes of genius as male. Across three experiments, we find evidence that these metaphors influence judgments of idea quality and perceptions of an inventor's genius. Moreover, these effects varied by the inventor's gender and reflected prevailing gender stereotypes: Whereas the seed (vs. light bulb) metaphor increased the perceived genius of female inventors, the opposite pattern emerged for male inventors.