| planet_and_moon| simulation of | compound shapes, |
| | gravitational system | :class:`Vec2D` |
+----------------+------------------------------+-----------------------+
+| rosette | a pattern from the wikipedia | :func:`clone`, |
+| | article on turtle graphics | :func:`undo` |
++----------------+------------------------------+-----------------------+
| round_dance | dancing turtles rotating | compound shapes, clone|
| | pairwise in opposite | shapesize, tilt, |
| | direction | get_shapepoly, update |
| two_canvases | simple design | turtles on two |
| | | canvases |
+----------------+------------------------------+-----------------------+
-| wikipedia | a pattern from the wikipedia | :func:`clone`, |
-| | article on turtle graphics | :func:`undo` |
-+----------------+------------------------------+-----------------------+
| yinyang | another elementary example | :func:`circle` |
+----------------+------------------------------+-----------------------+