After the presentation, I find out what is the good way to express each and whole budget data.
Each bar can express each budget data. There are leds. The led turn on and off by the budget data. Also, this can be room lamp. the whole bar can represent whole budget. I am not sure the idea which represent saving for an educational purpose. I can use whole led brightness. If brightness is high, people save money a lot. If not, it opposite.
Now I am thinking this project will make by metal.