It assumes, they can secretly assign and remember a 100 items random ordering and then execute it perfectly. Further, it assumes they can decide which orientation is the start vs end of the line. Thus, it's not actually possible, but 'in theory' it seems to work.

EX: If I know your going to order based on which side is closet to the entry door nob when the door is closed. Well nothing says they all enter from the same door if it's based on the wall, put the table in the middle of the room.