Pyramid
For an assignment at school I had to made a tangible user interface for someone in my class. It had to do with saving money with online banking.
I made a pyramid where you can see how far you are with your saving goal. My target group (someone in my class) was saving money for four different purposes. So each side of the pyramid is one purpose. She saves for school, for the future, for daily expenses and for a specific goal.
When selecting a category, you place the symbol to the front (where the display is). The display shows you how much you have saved for the category. The circle by the pyramid lights up with the percentage of your goal. Each category has a different light colour. Also the cube on the top lights up. This is also for grip while turning it. If you want to shut it off, you place the pyramid outside the holder.
See my other projects here