We're now going to learn how to change the colour of the turtle. Try typing
setc "green in the Command Centre and watch the turtle. Check. setc means set colour.

The " are very important. They enable the turtle to distinguish between:

• procedures (eg forward, right, square, pattern1),
• what's in a memory box (eg :side, :angle) and
• names (eg "red, "blue, "side, "angle).

Exercise 23 Try setc with some other colours.

Exercise 24 Teach the turtle the new word colsquare so that when you type (for example) colsquare 100 "red you get a red square. Check.