Desktop Terrarium - 100 mm

This is a small desktop terrarium base that fits 100 mm bath bomb molds/ornament bulbs like this one:

https://www.amazon.com/gp/product/B013I48KA6

Lay down a layer of gravel in the base, followed by a layer of horticultural charcoal. Add potting soil and plants that like higher humidity, such as mosses or ferns. I like terrariums that evoke miniature landscapes, so that's what I'm going for.

Tall, short versions included, as well as the OpenSCAD source. Displayed model is the short one.

Update: a week after transplant, the terrarium holds moisture well and the moss looks to be doing fine.