What do snowflakes, clouds, and this picture have in common? They're all "fractals:" cool patterns where each shape is made of smaller versions of itself. In a cloud, the big fluffs and tiny fluffs look the same. One famous fractal is the Sierpinski triangle pattern we see here. 3 triangles make a bigger triangle with a hole in the middle. Then that whole thing becomes one of 3 triangles in an even bigger one...and it just keeps growing!