The random movements here mimic tiny tadpoles that wander around with vigor. It is attracted to the mouse cursor along with more attractors when a mouse button event is fired. You can also see when moving the cursor slowly, some of the particles will follow as if inquisitive.
This can also emulate flies buzzing around an object and some will stay as if interested while others will ignore and fly away. Parameters can be changed to strengthen or weaken the movement's attraction and would add a subtle layer of animation depth for background ambiance or mouse movement interaction.
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