Here are a couple groupings of succulents shown in large jars – a layer-cake of soil, rock, and glass “ice” cubes.

This setup creates an interesting effect. Small amounts of water sometimes pool at the bottom, which humidifies the soil from below when exposed to the sun – a kind of sealed greenhouse effect. Lots of moss forming around the soil as a consequence.

Succulents include the tall euphorbia on the left.