My friends recently moved into a new house and found these wooden posts in the garden. In a roughly triangular formation, each is ringed by vertical copper(?) tubes, maybe 1cm wide. We assume that they supported something but can't figure out what. We thought perhaps it was for climbing plants, but there are much simpler options for that and the layout is weird. The estate agent didn't know what they were and my friends aren't in contact with the previous owners.

Two extra facts that may or may not be relevant - extensive work has been done to the garden but we don't know the timeline, so it's possible the wooden fence and paved area weren't there when the posts were added. Finally, the flower bed in the background was once a sandpit, which suggests that the garden has been modified for children at some point.

Edit: added some new photos, including a close-up top-down view. The pipes are nailed to the posts...

Wooden posts ringed with metal tubes

Top down view

Width across post

Vertical height

  • Maybe some kind of pest control? Are there pest animals in the garden? Or do they make a whistling sound with the wind?
    – benn
    May 7 '19 at 11:01
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    This might be the most intriguing post ever; kinda like watching LOST. I SO hope we get to know the answer to this one!
    – Evil Elf
    May 7 '19 at 12:10
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    Such tubes make me thinking it was some easy to install stuffs which was fixed with the lateral tubes. It seems there is nothing that go underground (e.g. some aeration, e.g. for a garden water tank. It is not very English manner, but ask neighbor, they saw, they know. May 7 '19 at 12:51
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    did the previous owner keep bees, or something: beesource.com/forums/archive/index.php/t-195827.html May 7 '19 at 17:39
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    My best guess is that these were foundations for three separate trellises.
    – Rob
    May 9 '19 at 20:06

could it be a wind organ


i built some using discarded 2L plastic pop bottles.

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