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I actually made this one to explain to a friend how particle springs work with kangaroo physics, but then I thought what the heck... wouldn't hurt if I upload it anyway.. 

There is one point in the middle which is the anchor point, connected with the surrounding points with springs (the springs are not shown/disabled). So basically if we change the location of the anchor point, - the other points will be dragged by the springs. Insanely easy... just like that...