Does this figure align in some sort of well-known patterns?

Question

I was watching a Japanese game show.

The contestants were asked to find the black area.

I could tell that the black area was half of the overall area. However, the contestants said that

The alignment of this figure was based on some rules.

He does not said what rules was it nor mention that it was simply half black half white.

I might be overthinking this, but I was pretty curious whether there was such rule or not...

EDIT: Again, I can see that the area was half black half white. However, I just want to know if there is a well-known rule or pattern that fits this type of alignment.

Answer 1

Take the black triangles as shown (in red) here:

Move them to the edges as shown here:

Now it is obvious that the coloured bits take up exactly one half of the big square.