An even simpler type of terrarium is one made in an open glass globe that looks like a fish bowl with only river rock in the base. This dirtless terrarium is the perfect surface for a tillandsia ...

The fish bowl appears in extreme close-up but… no, not a clue. It could be a bullet hole in reference to Toby's father's former profession but equally it could just be a rather crap snow globe.

Fish bowls are made of see-through glass or acrylics and are typically small and round or shaped like a drum. They are great for keeping one or two small fish, several plants or a terrarium.