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algorithm:
1 Go for a walk on a glorious summer day with a deep blue sky.
2 Go to an area with a lot of broadleaf trees.
3 Look straight up at the sky through the trees and walk untill you see a perfect blue hole between the branches and leaves of different trees.
4 Take a picture of the hole enclosed by leaves.
5 Make a square image of the blue hole in the center with a visually unbroken border of leaves and branches.
6 Make the image sharp.
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