An excellent example of a successful feedback system is the Toyota Prius display, which monitors energy and fuel consumption and allows the driver to witness their immediate effects on the cars' mileage.

Another example of a useful feedback device is the Wattson, which shows the individual in both numbers and colors, how much electricity your home is using at any given moment. It receives information from a transmitter attached to your electricity meter or fuse box and is beamed directly to your Wattson, which instantly displays your current usage.

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