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Ak for scale again -- I should have gone along with her idea of placing her next to the pillar. It is quite a bit bigger (and further) than it looks in this picture.

As you can figure, the obelisk is held together by the plant's roots when it's growing on top of the dune. As the sand moves away, the plant retains the pillar and keeps growing, perhaps through several such cycles before eventually succumbing to the harsh environment.

Amazing as it looks, it's even weirder 'in person.'

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