The nature of chalk is ephemeral and writings on Candy Chang's wall may be anonymous, but it is also public and witnessed attestations are more powerful motivators. Just ask anyone who has struggled with an addiction.
Contemplating death is a powerful tool to re-appreciate the present and remember what makes your life meaningful to you. We're all trying to make sense of our lives and there's great comfort in knowing you're not alone.
I often create over-spilled lists of all the things I absolutely need to do and need to do right now. Ideas from nowhere pile up on top of each other, like a game of "thought genga". I guess it's similar to creating a bucket list but one that needs the lot ticking off by the end of the day.