Here's my verdaccio rendering of it:
It makes pretty good pseudo-espresso. The ground coffee goes into the container between the two cones. The steam rising from the boiling water in the bottom cone passes through the container, and in about 3 minutes you get two espresso-size cups' worth of coffee. The difference between this and a true espresso machine is that proper espresso is made at 88 degrees Celsius, while steam is 100 degrees and up, which results in no foam. Apart from that, it tastes very good. It was invented in Italy (I think). I must reiterate that it actually makes something almost like real espresso (i.e. it's not a percolator, dripper, or any of those glass-and-plastic monstrosities that produce the icky brown stuff that some people pour into mugs and guzzle all day, imagining it's coffee.
What's it called?