This is the Circular Rainbow, also known as Halo, created by Azurekingfisher. The Lego MOC is exclusively made up of Lego tree leaves. In the recent past, these elements have been released in an increasing number of neat colors. Some of these colors are really hard to find. This mobile style creation is balanced and held up with only the thinnest string. The inner core is a clever sphere made out out leaves. The outer Halo is uses an incredible amount of pieces, and are all held together with with their own stud connections. A very tricky build, as the plastic these pieces are made with do not have the strongest grip. It looks like the slightest bump can cause the whole build to self destruct in a glorious and colorful explosion. The end result, which looks like a planet, is actually better for our environment than most Lego creations. As most of these pieces are now made out of biodegradable plastics.
You can see more photos of the “Halo (Circular Rainbow)” Lego creation over here: https://www.flickr.com/photos/127828422@N05/49889875607/