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The interaction begins on an intro screen featuring a large, glass-like dome at the bottom. Swiping up on this dome triggers a vibrant blue glow effect inside, followed by a morphing transition where the dome shrinks into a central '+' button. Simultaneously, social login buttons slide up from the bottom, and a dynamic, physics-based fountain of 3D bubble avatars erupts from the central button, floating upwards and orbiting in a continuous, playful loop.
