Slowly autumn arrives

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This is a picture from the "Decksteiner Weiher" in the south of Cologne.
The whole lake has an interesting shape. No surprise, since it's artificial.
Most of the trees are still green, but the chestnut trees are slowly changing their colors.
Strangest thing ever today: one of the trees bloomed while it's leaves were already brown and falling down.
Quite a surprise to see.