The Waterpebble, designed by Paul Priestman.

The “Waterpebble” is an innovative device that keeps an eye on water consumed when you take shower in the bathroom. Designed to be fully recyclable, the smart device monitors water going down the plughole, after each shower, to compare it with earlier showers, so you could manage or reduce your shower time and thus water consumption. Featuring an automatic mechanism, the Waterpebble takes your first shower as a benchmark and gently flashes “from green through to red” to stop the shower.

Priestman says that he “wanted to design something that takes the hard work out of going green and that helps people change their behavior so that eventually they are doing it automatically.”  Something like this might just work.  A rather strange video demonstrating how it works is after the break.

[Via Waterpebble; TheDesignBlog; Gizmodo]