Fireflies often flash in unison when in large groups.
A Crowd is a device for indulging ourselves in a kind of temporary insanity by all going crazy together.
The Crowd is a thing over which there always seems to float a vague distress, an atmosphere of pervasive melancholy, as if any large gathering of people creates an aura of terror and pity.
A Crowd is, proportionately to its size, magnifying of all that in its units pertains to the emotions, and diminishes all that in them pertains to thought.

The wisdom of the crowds is real - At a county fair where individuals guess the weight of an ox, every individual is wrong but the collective average, however, somehow becomes astonishing close
The Crowd can rarely account for its judgment... it has one opinion today, another tomorrow.
A Crowd is not company but a loveless thing where faces are but a gallery of pictures and talk but a tinkling cymbal.