Make changes to the square limit of wave shown in figure 2.9 by working at each of the levels described above. In particular:
a. Add some segments to the primitive wave painter of exercise 2.49 (to add a smile, for example).
b. Change the pattern constructed by corner-split (for example, by using only one copy of the up-split and right-split images instead of two).
c. Modify the version of square-limit that uses square-of-four so as to assemble the corners in a different pattern. (For example, you might make the big Mr. Rogers look outward from each corner of the square.)
exercise 2.49
Use segments->painter to define the following primitive painters:
a. The painter that draws the outline of the designated frame.
b. The painter that draws an ``X'' by connecting opposite corners of the frame.
