I have seen in photos (and once in person) terrariums from europe that are designed to make use of convection to ventilate themselves. They have small vents near the bottom and others at the top to allow warm air to rise and leave, with cool air coming in. This makes a lot of sense, and I'd really like to find some terrariums like this without going to (or shipping from) Germany. Has anyone here experience with these and/or know where to get them?
Some good plans would be great, as well.