How to draw a symetrical object
Draw an outline of a vase for example. Draw a line down the middle of the vase. Decide which side you like the best. Trace the outline. Flip the tracing over. Redraw the side of the vase by using the tracing as a carbon(joining up the lines to the first side).
You now have a vase that is symmetrical.
Remove vertical line.
This works for any object with equal sides.