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the 'movies,' and fishes swimming in water bear resemblance to birds flying in the air.
We are inclined to neglect our opportunities of studying
things in action. Now that most of us can see in the cinematographs things moving as they never (seemingly) moved before, we should be all the better primed for this very fascinating study.
When crows caw and circle round tall trees, or pigeons rise in great sweeps and eddies from the ground, ti seems as if they were weaving patterns against the sky, and if each little beak held a gossamer thread there would be an exquisite pattern floating against the clouds.
Given sufficient motives or reasons for gathering groups together, then the result must be patterns shaping and reshaping.