Six Hexagons Around a Hole
Each step keeps six smaller hexagons along the edge of the one before and leaves the middle empty. Two thirds of the area survives each step, and the central gap becomes more and more intricate.
A Snowflake in the Center
After a few steps, the empty middle draws the jagged outline of the Koch snowflake, another famous fractal, a pleasant surprise for children who color the pieces around it.
Simple Shapes, Rich Pattern
Every piece is a plain hexagon, easy to fill with a pencil, yet the whole page looks like lace. The color by step page helps to see which gaps belong to which step.