Before any blueprints are drawn, renderings are developed, or ribbons are cut, all big ideas start with a vision. Whether it is the proverbial light-bulb moment or an idea that builds gradually, nagging away at us until it fully takes shape, change starts internally. And Baltimore is a city primed and ready for that sort of change. The following 30 people represent the impetus for this kind of revolution, putting their noses to the grindstone every day without much fanfare or limelight. In a time when the news is dominated by the negative, this group of change-makers, ages 16 to 66, is reinforcing the power of the positive. From developing virtual-reality programs and building accessible public transportation to educating kids through the arts and working to eradicate food deserts, these local luminaries are shaping the future of Baltimore—one big idea at a time.