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1. "Every function has a color": `async` functions, from the external perspective, just produce a future you can handle like any other type of data.

2. "The way you call a function depends on its color": you can call an async function in Rust normally and just get the future if you want. You can give that to an executor or combine it with other futures. If you're in an `async` function yourself you can `.await` it.

3. "You can only call a red function from within another read function": See #2, you can call async functions from sync functions. You can even write your own executor if you want. @mgattozzi.dev made a nice example one to teach people how to do this: github.com/mgattozzi/wh...