noodles are like production systems: they seem pretty simple until you try to move
one where you want it to go. Try pushing on one end of a cooked noodle on a
countertop. It bunches up into a tangled mess. Now try gently pulling on the
end of the noodle. It follows your hand in a neat line. Rugs, beach towels, toy
trains, noodles: all are physical examples that remind us that pulling on
something is the best way to keep it orderly while moving.