Conceptual Design:

By rebuilding the project, we approach some possible ways of designing an ambient display of data. How to imagine interaction and scenarios in the future? This question would rely on evaluation of previous interactions and patterns that were involved in a seemingly careless way.

First, inspired by Daniel, we could try to monitor and simulate the falling leaves outside the window. Imagine an array of small leaves blowing IoT devices on the desk, or your table. It could inform you when the Autumn comes, by making you feel how the fallen leaves would fly in the air. It don't have to be a big movement, the dialogue and pattern this could enable is just compelling all by itself and its own ecosystem.

Second is to refine the bus tracker so it response to the snowData event published from the snow ball and multiply the estimated time of the bus and provide a more detailed and interactive ecosystem. Also, adding rain, wind and other possible and influential factors.
(Inspired by Dina, see code below)

Third is to refine the mechanism for rain drops and find a similar expression that is both fun and delicate. For instance, using a hobby motor to pull a string that is attached to a little wood block, making it move like dropping. And when the wood stick remains below the surface it could serve as a solenoid to punch the beads or other pieces upwards, providing potential possibilities to combine different expressions and patterns.