Code up a graphics class named "Drawer".

It's job will be to draw a variety of basic shapes such as ellipses and rectangles.

It will also draw fractals.

We do a quick estimate.

We think that just the fractal generation will take about 1,000 lines of code.

We're at a crossroads.

Should we dive in and start coding, or take a detour and look for code reuse?

We decide to visit "look for code reuse".

We pull out our #1 toolbox.

This toolbox contains reusable components.

We look in the toolbox and find a component that looks like it could help -- a FractalGenerator class.

We grab it.

We add the FractalGenerator as a component (ivar) on "Drawer".

When "Drawer" is asked to draw, it now simply delegates to it's component.

We replaced 1,000 lines of code with one message send by delegating to a component.