Block 1:   
   glBegin(GL_POLYGON);
      glVertex3f(20.0, 20.0, 0.5);
      glVertex3f(80.0, 20.0, -0.5);
      glVertex3f(80.0, 80.0, 0.0);
      glVertex3f(20.0, 80.0, 0.2);
   glEnd();

Block 2:
   glBegin(GL_POLYGON);
      glVertex3f(120.0, 120.0, 0.0);
      glVertex3f(180.0, 120.0, 0.0);
      glVertex3f(180.0, 180.0, 0.0);
      glVertex3f(120.0, 180.0, 0.0);
   glEnd();

Block 3:
   glBegin(GL_POLYGON);
      glVertex3f(20.0, 20.0, 0.0);
      glVertex3f(80.0, 20.0, 0.0);
      glVertex3f(80.0, 80.0, 0.0);
   glEnd();

Block 4:
   glBegin(GL_POLYGON);
      glVertex3f(-20.0, -20.0, 0.0);
      glVertex3f(80.0, 20.0, 0.0);
      glVertex3f(120.0, 120.0, 0.0);
      glVertex3f(20.0, 80.0, 0.0); 
   glEnd();

Block 5:
   glColor3f(1.0, 0.0, 0.0);
   glBegin(GL_POLYGON);
      glVertex3f(20.0, 20.0, 0.0);
      glVertex3f(80.0, 20.0, 0.0);
      glVertex3f(80.0, 80.0, 0.0);
      glVertex3f(20.0, 80.0, 0.0);
   glEnd();

   glColor3f(0.0, 1.0, 0.0);
   glBegin(GL_POLYGON);
      glVertex3f(40.0, 40.0, 0.0);
      glVertex3f(60.0, 40.0, 0.0);
      glVertex3f(60.0, 60.0, 0.0);
      glVertex3f(40.0, 60.0, 0.0);
   glEnd();

Block 6:
   glBegin(GL_POLYGON);
      glColor3f(1.0, 0.0, 0.0);
      glVertex3f(20.0, 20.0, 0.0);
      glColor3f(0.0, 1.0, 0.0);
      glVertex3f(80.0, 20.0, 0.0);
      glColor3f(0.0, 0.0, 1.0);
      glVertex3f(80.0, 80.0, 0.0);
      glColor3f(1.0, 1.0, 0.0);
      glVertex3f(20.0, 80.0, 0.0);
   glEnd();

Block 7:
   glLineWidth(5.0);
   glBegin(GL_LINES);
      glColor3f(1.0, 0.0, 0.0);
      glVertex3f(20.0, 20.0, 0.0);
      glColor3f(0.0, 1.0, 0.0);
      glVertex3f(80.0, 20.0, 0.0);
   glEnd();

Block 8:
   glBegin(GL_TRIANGLES);
      glVertex3f(10.0, 90.0, 0.0);
      glVertex3f(10.0, 10.0, 0.0);
      glVertex3f(35.0, 75.0, 0.0);
      glVertex3f(30.0, 20.0, 0.0);
      glVertex3f(90.0, 90.0, 0.0);
      glVertex3f(80.0, 40.0, 0.0);
   glEnd();

Block 9:
   glBegin(GL_TRIANGLE_FAN);
      glVertex3f(10.0, 10.0, 0.0);
      glVertex3f(15.0, 90.0, 0.0);
      glVertex3f(55.0, 75.0, 0.0);
      glVertex3f(70.0, 30.0, 0.0);
      glVertex3f(90.0, 10.0, 0.0);
   glEnd();

Block 10:
   glBegin(GL_QUADS);
      glVertex3f(10.0, 90.0, 0.0);
      glVertex3f(10.0, 10.0, 0.0);
      glVertex3f(40.0, 20.0, 0.0);
      glVertex3f(35.0, 75.0, 0.0);
      glVertex3f(55.0, 80.0, 0.0);
      glVertex3f(60.0, 10.0, 0.0);
      glVertex3f(90.0, 20.0, 0.0);
      glVertex3f(90.0, 75.0, 0.0);
   glEnd();

Block 11:
   glBegin(GL_QUAD_STRIP);
      glVertex3f(10.0, 90.0, 0.0);
      glVertex3f(10.0, 10.0, 0.0);
      glVertex3f(30.0, 80.0, 0.0);
      glVertex3f(40.0, 15.0, 0.0);
      glVertex3f(60.0, 75.0, 0.0);
      glVertex3f(60.0, 25.0, 0.0);
      glVertex3f(90.0, 90.0, 0.0);
      glVertex3f(85.0, 20.0, 0.0);
   glEnd();

Block 12:
   glBegin(GL_POLYGON);
      glVertex3f(20.0, 20.0, 0.0);
      glVertex3f(50.0, 20.0, 0.0);
      glVertex3f(80.0, 50.0, 0.0);
      glVertex3f(80.0, 80.0, 0.0);
      glVertex3f(20.0, 80.0, 0.0);
   glEnd();

Block 13:
   glBegin(GL_POLYGON);
      glVertex3f(20.0, 20.0, 0.0);
      glVertex3f(80.0, 20.0, 0.0);
      glVertex3f(40.0, 40.0, 0.0);
      glVertex3f(20.0, 80.0, 0.0);
   glEnd();

Block 14:
   glBegin(GL_POLYGON);
      glVertex3f(80.0, 20.0, 0.0);
      glVertex3f(40.0, 40.0, 0.0);
      glVertex3f(20.0, 80.0, 0.0);
      glVertex3f(20.0, 20.0, 0.0);
   glEnd();