We’ve seen our fair share of renders, concept designs, dummy units, and even prototypes that it sometimes becomes difficult to separate fiction from reality. Some of these concepts don’t even have working versions, leaving some to only dream of the possibilities. To be fair, creating even just a single working prototype can be difficult and expensive, especially when you’re dealing with novel materials and designs.
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https://www.slashgear.com/oppo-x1-2021-rollable-phone-hands-on-shows-its-almost-ready-17647807/