I don't have a real good technical response to your question but I'm
reminded, and strongly in a nostalgic way, the class coffee brewing
that my Father would do on the stove.

Here is a picture of one I found via Google:
http://www.cyberattic.com/stores/Win...yberattic.html

Watching the 1st bubbles of water percolate through the coffee grounds
and steep into the clear water below was very entertaining to myself
as a youngster- even though in later years I came to understand it
wasn't the best way to treat the coffee itself.

That said, having a see-through implement might have it's place in the
aesthetics department if in no other way.

Watching the tea brew can be part of the enjoyment.


berk