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It seems like the actual display he mentions in the article is available on alibaba as well, though it is $1500: https://www.alibaba.com/product-detail/Largest-E-ink-Display...

To get to that size stacking 3 of them on top of each other probably wouldn't look so bad, it'd be like having 3 <hr> tags on the page.

Hell, since we're talking wall-art here, just embrace the separated look and call it a triptych.