Here’s an example of using the Draw Inside mode and the Shape Builder Tool:
I’ve designed the watch strap and dial using the Shape Builder tool and the Artistic Effects available in Illustrator.
After drawing the dial of the watch, I switched to the Draw Inside mode to draw the hands of the watch and add some design strokes.
Artwork draw using any drawing mode can be edited in Isolation mode by double-clicking the artwork.
See Adobe Help for more information on the different drawing modes: http://help.adobe.com/en_US/illustrator/cs/using/WSf01dbd23413dda0e1e23acb6124476da654-7ff3.html
A serving bowl designed using the Revolve 3D effect
Using the Shape Builder tool to come up the initial structure and then used the 3D effect to design the bowl.