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The blue dot moves at the speed of the ripples, the phase velocity; the green dot moves with the speed of the envelope, the group velocity; and the red dot moves with the speed of the foremost part of the pulse, the front velocity.
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The red balloons are the most common tactic that "Pennywise the dancing clown"/"It" uses to make their victims scared. Famously, it is used in the opening scene in the book , first movie in the reboot films and in the "IT" TV miniseries where " Pennywise the dancing clown "/" It " uses a red balloon to lure Georgie into the sewer.