Behind window 11: Military precision.
There is something both awesome and disconcerting [perhaps even humorous] about people moving with seeming perfect harmony; dehumanised from each pole, either mindless robotic or hyper-mindful spiritual ecstatic. As precise mass movement can either symbolise the downtrodden [chain-gang prisoners’ lockstep or totalitarian society blind obedience] or the uplifted [synchronised cheer leading or Mexican waves].
The close order battle formations of the ancients changed the world [and remained in use until the mid 19th Century]. A fact not lost on organisers of mass parades and opening ceremonies ever since. The greater range and more forceful the movements [think the goosestep] the more powerful the precision seems.