Cloned Cube is a Portal mod. It takes place after GLaDOS' fall in Portal. You assume the role of Chell's secret clone. You have to escape or else you may just be tested to death. There is one obstacle. CUBiS is trying to kill you.
This is a giant "Extended Relaxation Elevator" built to accommodate test subjects as they move through Aperture's vast facility. As you can see, it is seventies-themed with a lot of shiny custom textures. The elevator will not actually move, it is just an optical illusion to allow for more detail using static props. The dust you see is smoke coming from the elevator and there will be a puzzle to activate the elevator. Coming up soon!