The symbols represent how to construct an object, while visual objects show the result. There are
four different types of symbols that can construct the same 3*3 quadrangle as in Figure 2. M1
constructs in zigzag pattern. M2 rotates from outside to inside in a spiral pattern. In M3, the turtle
constructs a facet starting from left bottom to upward using symbol ‘[ ]’ which means the turtle
remembers its position and then branches out to the right to make two more