This unique concept of washstand / toilet combination was designed by Bora Cakilkaya of Turkish design studio P-arch.  The fixture station focuses on the preservation of water.  The so-called gray water draining from the wash stand is stored in a tank below and, after a purification process, is utilized for flushing the toilet.  Another interesting aspect of the design is the idea of disconnecting of the washbasin and toilet from the wall and instead setting them in the center of the space.

The design won the 2nd place in the Green Dot Awards in 2009.  Found via Design Milk.

Plus Wash Station 01

Plus Wash Station 02