*19.05.1938 Berlin/Germany KD studied business administration, not art, but he pursued an interest in painting from his early years. KD lives near Berne/Switzerland.
Start with a unit square and successively inscribe smaller squares that are rotated a constant amount. Four spirals emerge. The distance governs the angle of rotation. You can see how the corresponding vertices of the successive squares form four spirals, especially with more squares and at values of d close to 0 or 1.