Each sheet can have its own drawing layer that can
contain built-in shapes, custom shapes, and annotations (free-hand drawings).
You can use shapes and annotations to draw
attention to parts of your spreadsheet or to emphasize some information or process
involving the use of the spreadsheet. For example, you can display a logo on
your sheet, show a process with flowchart-like graphics, or use shapes to
simply highlight a particular result.
You can add free-hand drawing to the drawing layer of the sheet using annotation
mode. Annotation mode allows the user to draw in free-hand mode on the shapes
layer and to save the annotation on the sheet as a shape.