He bares his souls so much in his book, his struggles with God and the people. And he is so insightful in his images. He sees God's hands at work in the little things all around him. God directs Jeremiah to go down to the Potter's house and observe. What Jeremiah saw was a seen that would be very similar if we went today in to a pottery workshop.
Potters still use spinning wheels.
Today they may be driven by electric motors, back then they were driven by a foot pedal. The potter begins with a lump of moist, fresh, shapeless clay. It gets plopped right in the middle of the wheel. And then the spinning begins. It goes round and round as the hands of the potter apply pressure to the clay.