Stones For A Sidewalk
It looks like a sidewalk is built with thousands of separate stones. But this is only an illusion. At least sometimes. When a new sidewalk is built the part which shall be concreted is marked. Now a special trick is used to make the sidewalk look like a path made of many separate stones.
Construction workers use metallic frames that are shaped like bricks. They put the little frames together to one big frame and stamp it into the wet concrete. After it dried the whole sidewalk looks like it is made of many separate bricks.