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There are some strategies. One is using color. Blue always fades away in the distance. Also lines can be used to lead the eye into suggested 3D. Or a small element like the blue flag at the image underneath.
Up: Flevoland (NL). 12/3/15. 3.44 pm
Under: Schermer (NL). 12/3/20. 1.05 pm.
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