The Islamic world also produced the triangular latin sail, which became super important because it allowed ships to tack against the wind. This meant that a skilled crew could make their way through the ocean even if they didn't have a strong tailwind. And just as with the Silk Road, ideas also traveled in the monsoon marketplace. For instance, today, more Muslims live in Indonesia than in any other country. And yes, I know Indonesia has more than two islands. It's not to scale, obviously. Knowing what you've already learned about the growth of Islam and the spread of trade, it won't surprise you to learn that Islam spread to Indonesia via the monsoon marketplace.