On limbo since it is a exact replica of Earth just without humans and without color all the materials are still there scientists workers and anybody else of various species all work and study primarily on limbo where it has untapped oil reserves due to the lack of mining and as well as metals and other materials that have been picked clean from Earth, people here have adopted to where bright colors or at least paint with bright colors due to the lack of pigments and colors on limbo it would drive people mad so they compensate for this with neon colors.