Thick clouds are stage objects found in Welcoming Unit, Super Fuse Challenge Time, The Third Wheel, and Weather Vane. Unlike most other clouds that are purely cosmetic, these are thick enough to support several loose Goo Balls, depending on how large the cloud is. They also give slight additional support to structures. Loose Goo on clouds don't move even when they are awake. Thick clouds can also be considered to be like small platforms. Thick clouds can also support signs.