From today’s beach comb at the town of Petoskey. When polished, they show a beautiful pattern like the little stone on the right. These are fossilized coral and are the official stone of Michigan. Could have made a better photo, but sooo tired after a long drive home after 2 weeks away.
https://digital-photography-school.com/mastering-panning-to-photograph-moving-subjects/
https://www.instructables.com/id/Panning-The-Art-of-Motion-in-Photography/