The largest circle (with a diameter of 7.50/7.60 metre) and the smaller circle (diameter 3.30 metre) are anti-clockwise. The other 2 circles (with diamters of van 3.10/3.30 meter) clockwise. After a while, around the largest circle appears a ring of 20 cm. width, but that was maybe a hoax.

Source: Dick van den Dool.