Getting excited over interactive animations like is just one of those things I’ve never really outgrown! 
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If you circles with the mouse around the particles, faster than the speed of particles, they get caught in the “mouse event horizon” and cannot escape.
Not a black hole, but a colourful finger… 
Edit: hmmm, this could actually be a new game idea. If particles touches mouse they explodes, if mouse circles around particles, they form blob, etc
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