From the Porch Swing

摘要

Can you make a box with nine dots? Sometimes I train students in non-bulk packaging, which eventually gets around to boxes. In a parcel handling environment that involves conveyor belts and/or automated sorting, a box could end up with any surface downward, even if only temporarily. So if an inner container were to leak inside that box, gravity would pull the contents - often liquid - downward, and downward could be toward any surface, depending upon where the box was in the sort process.