So, recently we did a post on a toilet design that, in our humble opinion, the very cutting-edge Australian manufacturer Caroma got wrong. But here is an example of a line that it hit out of the park. Last fall, the company unveiled the Invisi Series II wall-hung and wall-faced toilet line. Unlike U.S. toilets with a visible tank, these products feature the tank and flushing mechanism installed between the wall studs. The resulting look is sleek European, but it also frees us space in the bathroom. The toilets also continue Caroma’s reputation for saving water: the units can flush with 0.8 gallons of water for liquid waste or 1.28 gallons for solid waste. They start at about $1,000. www.caromausa.com.