http://www.potsaa.com/pitcher-jug/

There is a type of pitcher or pot that seems backwards. What's this?
It makes me mad! The other day I found an article on Wikipedia for a launcher that when you pour the liquid, it becomes immediately outside of the pitcher (or something). It is a real mind boggler. But I can not remember her name. Any help?
This looks like a Klein bottle. A bottle Klein is the 3-D equivalent of the Moebius strip. The Möbius strip is a loop with a key in it, whether inside the loop is connected to the outside. If you draw a line along the inside of the loop, this line will eventually find out, without ever lifting the pencil. It only one side of the band. The Klein bottle is the same idea. "Interior" and "outside" are in fact the same "side". Does that sound like what you hear?
SIMON LEACH – Making a largish pitcher (jug)