This is a 20 x 20 build platform, extremely useful for sandboxes where you need a platform to get away from all the activity on the ground. It comes with variable textures so you can ensure you don't lose objects against an inappropriate background colour, plus a grid texture useful for measuring objects.
Also included is a visual timer that counts up to let you know how long you have had the platform rezzed. This is to avoid getting so caught up in your building that you forget about the return time for objects in certain sandboxes. If you create a notecard containing parcel names of sandboxes and their return time in minutes, the platform will warn you at intervals as auto return time approaches. There is an notecard with some well known sandbox names and their return times included as an example.
See item in Second Life