particles

I BET YOU CAN'T TELL IF THE PARTICLES ARE 'MOVING' THROUGH EMPTY SPACE IN CURVED TRAJECTORIES; OR STRAIGHT TRAJECTORIES THROUGH CURVED SPACE; OR BOTH, OR NEITHER, OR SOME COMBINATION THEREOF OR OTHERLYISH; OR WHETHER OR NOT IT'S JUST A FREE HAND DRAWING BY A SANDBOX TREE CONSUMING TASSELED WOBBEGONG!