Logo programs are usually collections of small procedures. Generally, procedures are defined by writing them in a text editor. The special word to is followed by the name of the procedure. Subsequent lines form the procedure definition. The word end signals that you’re finished.
Turtle Blocks is an activity with a Logo-inspired graphical “turtle” that draws colorful art based on snap-together visual programming elements. Its “low floor” provides an easy entry point for beginners. It also has “high ceiling” programming, graphics, mathematics, and Computer Science features which will challenge the more adventurous student.