But why not bath-tubs and sinks that come equipped with built-in taps and containers where you can store whatever type of liquid you need? Liquid soap, shampoo, certainly. Also useful for: hair gel, lotions, perfume, shaving cream, orange juice, liquor and whatever else you might need in the bathroom.

So what's the advantage over the usual plastic containers, you might ask. Well, for one thing when you're in the bath you might be too lazy to climb out and reach that shelf where your shampoo is kept, or you might just freeze to death if you get out. Besides, the built-in containers can store a lot more stuff. And turning on a tap is just so much more convenient.

With some modifications, you can make the stuff come out from your shower sprinkler too.