Japanese Toilet Efficiency

In conjunction to the earlier bathroom photo from Japan I need to tackle more fundamental questions about space and efficiency. Space is clearly lacking in Japan and most bathrooms offer no more space than whatever is needed for a toilet. Now efficiency ticks in by leaving out space for a washbowl and placing the sink directly onto the water tank. Needless to say, if you flush the toilet then water comes out automatically from the faucet. The first catch is that it doesn’t stop after your hands are washed. The second catch is that nobody knows if it is drinking water. It's definitely no 'eau de toilette' I was told.

Photo from Miyajima, Japan in October 2006.