https://www.youtube.com/watch?v=zg4ncWWqjno
Their layered construction can be described, from top to bottom, as follows:
1. A chamber for hot water. The top is open and has a lid. The bottom of the chamber has a number of very small holes, so that water will slowly drip through the bottom of the chamber.
2. A holder for coffee grounds. There are larger holes in this layer, so that water passes relatively quickly through the grounds during brewing.
3. A chamber to catch the brewed coffee.