Bezier Selection Bezier selection is a powerful tool in The Gimp. And since many of us gimpers don't have a graphics tablet, it's not so easy to make the mouse pointer move the way you want. Bezier selection fixes the problem by using smooth mathematical curves instead your own shaky mouse trail. Bezier selection is a tool to make complex selections by specifying certain points that are connected together with a curve. So to make a box you would specify four points, one for each corner of the box.
Example is on the right side.
The great thing is the corners don't have to be 90 degrees. Finally click inside our 'box' to turn it into a selection. Of course you can have as many points as you need. Modifying the curves Straight lines alone are a useful thing, but it's not all. Actually they are not lines but curves.