Smith and Hawken have these wonderful ferns that grow on a lava rock. The lava rock sits in a big glass bowl with small stones and water in the bottom. The lava rock wicks up the water to the fern! If you want to see one you will have to visit a store or take a trip to Hawaii. I bought one as a gift, but did not have my camera with me. I found a black lava rock in my yard and stuck some succulents in it for a similar effect.