The Art of Tree Camouflage

They were constructed behind the lines using sketches drawn by a camouflage artist on the battlefield. A camouflage team would then cut down the real tree at night and replace it with the replica. The observer could then crawl in and watch the Germans in full view, while protected by the tree's steel core.They were often situated in flat, exposed areas in No-Man's-Land, where there were no natural surveillance points and the need for observation posts was greatest. Producing the sketches and positioning the camouflage trees were both highly dangerous tasks.
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Camouflage played a very important role in both World Wars

That's extremely clever Brother Dale.