Clear everything deletes all agents and sets the terrain to white.
Draw 3 squares is a push button widget that draws 3 squares of different sizes.
Draw a face is a push button widget that draws a simple face.
create 1 turtle agent is a push button widget that creates 1 red agent.
animate! is a toggle button widget that tells the turtle agents to draw a circle and change to random colors.
Draw lots of squares is a toggle button widget that tells the turtle agents to jump to different locations to draw different size squares of different colors.