Ball bearings in a bowl start out packing together with many flaws.
Tweezers or a magnet and a nail Assembly Fill the plate with a layer of ball bearings one layer deep. Go all the way to the edges and up the edges a little bit. Notice local patterns, and changes between patterns. Notice how one ball bearing is surrounded by 6 others, and how the six form a hexagon. Notice how occasionally a ball bearing is missing from the pattern.