Here's what Stratus say about the Ceiling Cloud:
The Primacoustic Stratus is an acoustical device that suspends above the recording console to control early reflections, flutter echo, and to help eliminate standing waves that cause resonant peaks in the critical mix position. Once in place, you will immediately enjoy a more controlled and intimate acoustic environment, larger sweet spot, and reduced ear fatigue.
Attractive and very affordable, the Stratus ships in kit form and is easily put together in minutes using a simple screw driver. The kit includes a 2″ thick, 24″ x 48″ acoustic panel made from high density 6lb per cubic foot (96 kg/m³) glass wool and suspension hardware. The glass wool is encapsulated with micromesh and the edges are resin treated to retain the minute fibres. For an attractive appearance, the panel is covered in an acoustically transparent fabric.