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When previewing the 'Echo' screen effect in Apple Messages, the central message bubble multiplies into dozens of smaller duplicates. These 'echo' bubbles orbit the original message in a simulated 3D space, scaling up as they move closer to the foreground and shrinking/fading as they recede into the background. The motion uses organic, physics-based easing to create a swirling, celebratory vortex before the duplicates gradually disperse and fade away.
