You can own a self contained aquatic ecosystem. Of course I'm not so much worried about owning it, but I think it is pretty cool that they exist. I wasn't aware, but apparently NASA has already found uses for the sphere.
"Inside each glass sphere are algae, shrimp, and micro-organism in natural sea water. They have an average life expectancy of 2+ years and require no feeding or cleaning."
Pure Modern is selling them for $55 probably a high price because not many people feel the need to buy their own and the amount need to be high to profit. This price will get you a 4-inch ecosphere, but you can inquire about larger ones by calling.
I think this is something that would be interesting to have in a classroom.
