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It doesn't have the vertical stability to stand on its own. You need to make it thicker (how thick depends on how tall, but the important aspect is the staggered construction of multiple layers giving a similar self-reinforcement) to give it the proper foundation. Keep in mind that it's multiple thin horizontal layers held by a relatively weak adhesive, not a solid object.

A wavy wall reinforces itself against the same forces (wind being the big one) allowing for thinner construction at an equivalent height.




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