Shaping Stone Workbench is what you can use to discover new shapes. There are currently three panels that you can use in order to construct your new shape: square, equilateral triangle, isosceles triangle. Any shape that is built must be closed (not have any open spaces).
The Shaping Stone Toolbar allows you to have greater control in making shapes. When a tool is selected, a starburst will appear around its icon. Tools only apply to the selected panel, which is coloured green.