Functional streams are a vital tool in any ecosystem. They can simplify the code for webservers, event loops, and data-intensive applications. But they are notoriously difficult to understand. In this talk, we'll explore a mental model of stream execution in fs2, a functional stream processing library in Scala. We'll use our model to draw simple diagrams for complex streaming scenarios, and see how these diagrams can be generated automatically using the [aquascape](https://zainab-ali.github.io/aquascape/) library. Finally, we'll bring our model to the masses. We'll use Scala.js to create interactive, browser-based diagrams that can be integrated into fs2's online documentation. By the end, we'll have a solid understanding of functional streams. With aquascape, you'll see that streams are not only easy to read, but easy to reason with too.