Magical beings have managed to tessellate Magical beings have managed to tessellate an entire plan, indefinite, in the way the following figure shows a detail: ![picture with black and white hexagons]( They have done it by assembling pieces all the same, each of which was formed by a few white or black hexagons. What fraction of the entire surface of the plane is black?

You may tessellate the plane with this shape made of 8 hexagons (only look at the whole hexagons in the image):

As there is one black hexagon in each shape, the percentage of black hexagons in the limit is $\frac{1}{8}$

But as other have said, it is not trivial to rigorously define "the percentage of black hexagons" in an infinite plane.

![enter image description here](