This piece here is a classic design that has been around for centuries.  This is one that cannot be improved on any more because...how can you?  This is a tea pot.  A tea pot is made to just boil some water, but the genius thing about it is the spout where it comes out of.  That spout is the whole reason for why I think this is a great design  The spout comes with a lid that has a tiny hole in the center of it.  The purpose of this hole is to inform you when the water is boiling because there will enough steam being produced that when it trickles out of the hole hard enough then it creates this high pitched noise that is hard to miss.  Then when you want to pour yourself a cup of hot water for you tea, all you do is lift the lid that's covering the spout and pour.  It's a very simple and functioning design.