It serves as a reminder of thousands of years of rainfall and melting snow eroding the earth. Perhaps that is the greenest thing about the Erosion Sink by Gore Design.
Every time you use the sink you'll be reminded of the earth's age and our impact on it over time. Gore Design is a company dedicated to sustainability in manufacturing concrete sinks and countertops as well as cabinetry and furniture fabricated of Plyboo and formaldehyde-free products.
Now, great looks and important messages aside: would the "topography" of this sink make it tough to clean?
(via Treehugger and February's Dwell) -regina