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Pigeons flying exercise. My primary school was in Fortress Hill, North Point. I always watched pigeons flying outside when I lost my concentration in the class. I didn't know why they fly along a circular locus, repeat and repeat, non-stop.

Here is outside Yuen Ling's home in BJ, different groups of Pigeons flying along their loci without crashing together. It's long time without watching this scene in HK.