https://finance.yahoo.com/news/lenovo-folding-laptop-x1-prototype-223000912.html

The X1 prototype is an impressive device to behold. Like the Galaxy Fold, the screen folds in on itself like a book. But whereas the crease where the Fold bent was fairly visible, the Lenovo PC's crease is more difficult to make out. It's still there when you look at the screen at the right angle, but it doesn't stand out quite as much.

The version of the X1 prototype I used was very much an early stage product, and as such I wasn't able to do much with it outside of see that it was running some version of Windows 10, as well as fold and unfold the display. I was also unable to look at the hinge mechanism, as that's still being finalized by Lenovo.