The document contains code to draw different shapes using the size, point, line, rect, and ellipse functions in a 240x240 canvas. It draws a point, crosses, rectangles, concentric squares, circles of increasing size, and a circle with nested shapes.

16. size(240,240);
point(120,120);

18. size(240,240);
line(120,0,120,240);
line(0,120,240,120);

20. size(240,240);
line(0,0,240,240);
line(0,240,240,0);

22. size(240,240);
rect(0,0,120,120);
rect(120,120,120,120);

24. size(240,240);
rect(0,0,80,80);
rect(80,80,80,80);
rect(160,160,80,80);
rect(160,0,80,80);
rect(0,160,80,80);

26. size(240,240);
ellipse(120,120,240,240);

28. size(240,240);
ellipse(60,60,120,120);
ellipse(180,180,120,120);
ellipse(60,180,120,120);
ellipse(180,60,120,120);

30. size(240,240);
ellipse(120,120,240,240);
ellipse(60,120,120,120);
ellipse(30,120,60,60);