Okay, we now know what fractal patterns look like and how to estimate the size of the victim's rib.

Now what?

Now it is time to think about whether it is even possible to engrave such structures into a bone. Since our killer is under house arrest, I assume he has no access to fine engraving machines or lab equipment. Therefore I searched for micro engraving tools online and found out that widths up to 0.5 mm are available.

To continue, the smallest square that can be achieved with such a tool is 0.5 mm by 0.5 mm, which gives an area of 0.25 mm². So what?

Previously we assumed that the area of the rib head is about 66 mm². If it were flat, this area could be engraved with 0.25 mm² small squares, resulting in a maximum of 264 such fields (this will be relevant in the next chapter on QR codes).

Since the pattern is a kind of Sierpinski fractal, how many iterations can be engraved on a bone considering the given dimensions?

The reduction factor of the fractal is 1/3, so we can calculate the sides of the white squares until they become smaller than 0.25 mm². I won't go into the details here, but we can achieve three levels, which gives 73 white boxes.

Thus we see that it is possible to engrave a sufficient fractal on a rib head with a micro-engraving tool that is not part of high-tech equipment.

In part three, I will talk about why this is relevant.

**Continue with Part 3.**