Very popular in Japan, the Kokedama (Pearl of Moss) are floral installations composed of plants of various kinds housed inside a ball of moss. They can be hung or placed on a tray, they are watered by immersion and do not require fertilization.

The Kokedama is a sphere of earth covered in moss with essences grown inside.
Given the reduced amount of land, the plants tend to remain small and develop a root system suitable for the dimensions of the sphere.
Kokedama also live well indoors, but don't forget that they are live plants and need water and sun.