Comparing a Rails library to a bridge isn't quite right. Most things lone hackers write are bike sheds and family homes. No one builds a bridge alone. You want

Comparing a Rails library to a bridge isn't quite right. Most things lone hackers write are bike sheds and family homes. No one builds a bridge alone. You want a legacy? Move up the food chain and start discovering new data structures and algorithms. Or work on a large project like GMail.