For most of the pandemic a bright green kite was stuck 100 feet up in the crown of a pine tree next door. Seeing it always bummed me out, it was a wrong state of affairs nobody could fix.

The atmospheric river finally just shook it loose into our yard. Turns out the bright green quality was owing to it being either a dragon or maybe a T. Rex (because arms).

We hung it on a gate where it flapped in the wind and freaked out the neighborhood cats. Next day it was gone. Could be the original owner has it back now; could be they’ve learned something about pine trees.

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Basic models of flocking behavior are controlled by three simple rules: 1) separation: avoid crowding neighbours (short range repulsion); 2) alignment: steer towards average heading of neighbors; 3) cohesion: steer towards average position of neighbors (long range attraction). With these three simple rules, the flock moves in an extremely realistic way.