The last 18 dots aren't logical. They form diagonal lines from the middle to the sides, upwards. I hope it helps!!

Thanks for the hint!

The diagonal lines Robert mentioned go from the bottom posts. 3 on each side. The hint really helped.

Not only a random design, at least 18 dots are random as well...

Grazie per l'aiuto.

Would have been guessing a long time without direction from Robert. Thanks to both of you.

Thanks for the hints.

Thank you for the hint.