Draw a vertical rectangle on your piece of paper.
Draw a second rectangle (of equal size) at a 45-degree angle so that the top right corner of each shape overlaps one another.
Draw a third rectangle (also of equal size) at an opposing 45-degree angle so that the bottom corner of rectangle two and rectangle three overlap.
Draw a fourth rectangle (also of equal size) vertically so that the upper right corner of the third and fourth shapes overlap.