The mouse is able to communicate three different properties of data. It can show you the weight of files and folders, by braking with different force, according to the file-size. Or you can set a custom weight for files, just like the color marking function in MacOSX. So you can find important files more easily.
The third property, the mouse can show you, is the activity of files and folders. By ‘breathing’ with different intervals, it shows how much a file was opened or how busy a folder has been recently.
(via today and tomorrow)