Architecture blog 3rings highlights this modern yet low-tech sink design by Maja Ganszyniec
Inspired by traditional pre-plumbing sinks, the designer located the drain outside the basin. "To get rid of the grey water we have to tip the water out. By doing so we become more conscious of how much water we are using and mainly throwing away".
I'm not sure how practical it is, especially with in the house, but it's a lovely implementation of a thought-provoking concept.
Image from . Thanks to Re-Nest for the tip.