DataBot Mouse is very interesting experiment by Jan Barth and Roman Grasy. They’ve developed a computer mouse which can give data physical properties, to make the communication/interaction between man and data more human and easier to understand.
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.