I had to use a lot of intuition on this one. upper left and lower right are white triangles outlined in black, upper right and lower left are black triangles outlined in black, then the square in the center is a similar pattern, but rotated, and then two random diagonals in the leftover space.

10 mn avec le principe du négatif / positif. N'héistez pas à le tenter.

> 101 solutions.