The sheet widget can also display rank 0, 1 and rank 2 tensors. These ranks are single values, a string of values, or a 2D matrix of values, respectively. For example, if you create a parameter, and set the initial condition to rand(3,5) (for reference, see section (§4.4.3) ), you can wire that into a sheet. The sheet will then diplay the data in a grid display within the widget box.
If you have RavelTM installed, you will see a small Ravel icon in the top left corner. Clicking this causes a ravel window to pop up, allowing you to manipulate the input data to the sheet, so as to change slices or rotate a multidimensional datacube.