The idea comes from reusing the wasted water.
Upon the sink, there is a switch which controls the direction of water flow. When it’s on, the water will be filtered and flow into the water tank on the left. Later the water can be used to flush the toilette.
If water is really dirty, the switch can be turned to the right to let the water flow along its normal way.
The sketch is made in Adobe Illustrator in around 15 Minutes. The background and the color will be made in Photoshop in around 10 Minutes.
