The Secret of Four
Step 1: Preparation: Draw 9 points on a sheet of paper, placing them as shown in the photo.
Step 2: Assignment: Tear, without removing the handles from the sheet, draw through all 9 points of a broken line consisting of 4 straight segments.
Step 3: Did you succeed? Compare what you got with the answer, following.
Step 4: Here's the sequence in which we connect the dots.
Step 5: Not as difficult as it might seem, right?