How to display simple data that might change your habits? Bath might be a very relaxing moment and some people really forget about the environmental and infrastructural costs involved in storing, treating and transporting water. Maybe the financial costs are still low, but definitely this is not a long term truth. Hydrao developed a shower that changes colors to signal the volume of water used while you are bathing. It is interesting that while a number might work as a direct message, colors are in the background, more subtle, and only disrupt the experience of bathing when necessary (red and blinking, for instance).