A non-terragen way but very interesting
http://www.dailymail.co.uk/sciencetech/article-2267504/The-sealed-bottle-garden-thriving-40-years-fresh-air-water.html
That's awesome! I've always been fascinated by the idea of "biospheres" and wanted to have one since I was a kid. I tried creating a home-made one in a big jar once, it worked sort of, but had a lot less visible interesting stuff in it than a plant like that (mostly microscopic, but lots of snails too, hehe). I'd like to try again one day...
- Oshyan
I wonder... will seeds work as well?
i remember seeing biospheres in catalogs when i was a kid, wanted one but they were too expensive.