The tool opens to show an empty 10 x 10 grid onto which you can drag shapes from the dock at the bottom of the screen. Shapes that are on screen can be dragged around, or rotated by dragging the double-headed arrows which appear when the shape is selected. Any unwanted shapes can be deleted by dragging them into the bin.

Click on one of the buttons at the right of screen to position a “mirror” across the middle of the screen: horizontally, vertically or on either diagonal. Only one mirror can be used at a time - any new choice replaces your old one. Click the ‘Reflect’ button to reflect everything on screen in the current mirror.

Click the ‘Show grid’ button to hide the grid (click again to show it once more).

Clicking Reset undoes all changes you have made, returning the tool to its default state.